diff --git a/src/portable/renesas/rusb2/dcd_rusb2.c b/src/portable/renesas/rusb2/dcd_rusb2.c
index 27d525b68..833737181 100644
--- a/src/portable/renesas/rusb2/dcd_rusb2.c
+++ b/src/portable/renesas/rusb2/dcd_rusb2.c
@@ -63,22 +63,11 @@
 // MACRO TYPEDEF CONSTANT ENUM
 //--------------------------------------------------------------------+
 
-/* LINK core registers */
-#if defined(__CCRX__)
-  #define RUSB2 ((rusb2_reg_t __evenaccess*) RUSB2_REG_BASE)
-#elif defined(__RX__)
-  #define RUSB2 ((rusb2_reg_t*) RUSB2_REG_BASE)
-#elif (CFG_TUSB_RHPORT1_MODE & OPT_MODE_DEVICE)
-  #define RUSB2 ((R_USB_HS0_Type*)R_USB_HS0_BASE)
-#else
-  #define RUSB2 ((R_USB_FS0_Type*)R_USB_FS0_BASE)
-#endif
-
 /* Start of definition of packed structs (used by the CCRX toolchain) */
 TU_ATTR_PACKED_BEGIN
 TU_ATTR_BIT_FIELD_ORDER_BEGIN
 
-typedef struct TU_ATTR_PACKED {
+typedef struct TU_ATTR_PACKED _ccrx_evenaccess {
   union {
     struct {
       uint16_t      : 8;
@@ -186,52 +175,53 @@ static unsigned find_pipe(unsigned xfer)
   return 0;
 }
 
-static volatile uint16_t* get_pipectr(unsigned num)
+static volatile uint16_t* get_pipectr(rusb2_reg_t *rusb, unsigned num)
 {
   if (num) {
-    return (volatile uint16_t*)&(RUSB2->PIPE_CTR[num - 1]);
+    return (volatile uint16_t*)&(rusb->PIPE_CTR[num - 1]);
   } else {
-    return (volatile uint16_t*)&(RUSB2->DCPCTR);
+    return (volatile uint16_t*)&(rusb->DCPCTR);
   }
 }
 
-static volatile reg_pipetre_t* get_pipetre(unsigned num)
+static volatile reg_pipetre_t* get_pipetre(rusb2_reg_t *rusb, unsigned num)
 {
   volatile reg_pipetre_t* tre = NULL;
   if ((1 <= num) && (num <= 5)) {
-    tre = (volatile reg_pipetre_t*)&(RUSB2->PIPE_TR[num - 1].E);
+    tre = (volatile reg_pipetre_t*)&(rusb->PIPE_TR[num - 1].E);
   }
   return tre;
 }
 
 static volatile uint16_t* ep_addr_to_pipectr(uint8_t rhport, unsigned ep_addr)
 {
-  (void)rhport;
+  rusb2_reg_t *rusb = RUSB2_REG(rhport);
   const unsigned epn = tu_edpt_number(ep_addr);
+
   if (epn) {
     const unsigned dir = tu_edpt_dir(ep_addr);
     const unsigned num = _dcd.ep[dir][epn];
-    return get_pipectr(num);
+    return get_pipectr(rusb, num);
   } else {
-    return get_pipectr(0);
+    return get_pipectr(rusb, 0);
   }
 }
 
-static unsigned edpt0_max_packet_size(void)
+static uint16_t edpt0_max_packet_size(rusb2_reg_t* rusb)
 {
-  return RUSB2->DCPMAXP_b.MXPS;
+  return rusb->DCPMAXP_b.MXPS;
 }
 
-static unsigned edpt_max_packet_size(unsigned num)
+static uint16_t edpt_max_packet_size(rusb2_reg_t *rusb, unsigned num)
 {
-  RUSB2->PIPESEL = num;
-  return RUSB2->PIPEMAXP;
+  rusb->PIPESEL = num;
+  return rusb->PIPEMAXP;
 }
 
-static inline void pipe_wait_for_ready(unsigned num)
+static inline void pipe_wait_for_ready(rusb2_reg_t * rusb, unsigned num)
 {
-  while (RUSB2->D0FIFOSEL_b.CURPIPE != num) ;
-  while (!RUSB2->D0FIFOCTR_b.FRDY) ;
+  while ( rusb->D0FIFOSEL_b.CURPIPE != num ) {}
+  while ( !rusb->D0FIFOCTR_b.FRDY ) {}
 }
 
 static void pipe_write_packet(void *buf, volatile void *fifo, unsigned len)
@@ -284,61 +274,70 @@ static void pipe_read_write_packet_ff(tu_fifo_t *f, volatile void *fifo, unsigne
   ops[dir].tu_fifo_advance(f, total_len - rem);
 }
 
-static bool pipe0_xfer_in(void)
+static bool pipe0_xfer_in(rusb2_reg_t* rusb)
 {
   pipe_state_t *pipe = &_dcd.pipe[0];
   const unsigned rem = pipe->remaining;
+
   if (!rem) {
     pipe->buf = NULL;
     return true;
   }
-  const unsigned mps = edpt0_max_packet_size();
-  const unsigned len = TU_MIN(mps, rem);
+
+  const uint16_t mps = edpt0_max_packet_size(rusb);
+  const uint16_t len = tu_min16(mps, rem);
   void          *buf = pipe->buf;
+
   if (len) {
     if (pipe->ff) {
-      pipe_read_write_packet_ff((tu_fifo_t*)buf, (volatile void*)&RUSB2->CFIFO, len, TUSB_DIR_IN);
+      pipe_read_write_packet_ff((tu_fifo_t*)buf, (volatile void*)&rusb->CFIFO, len, TUSB_DIR_IN);
     } else {
-      pipe_write_packet(buf, (volatile void*)&RUSB2->CFIFO, len);
+      pipe_write_packet(buf, (volatile void*)&rusb->CFIFO, len);
       pipe->buf = (uint8_t*)buf + len;
     }
   }
+
   if (len < mps) {
-    RUSB2->CFIFOCTR = RUSB2_CFIFOCTR_BVAL_Msk;
+    rusb->CFIFOCTR = RUSB2_CFIFOCTR_BVAL_Msk;
   }
+
   pipe->remaining = rem - len;
   return false;
 }
 
-static bool pipe0_xfer_out(void)
+static bool pipe0_xfer_out(rusb2_reg_t* rusb)
 {
   pipe_state_t *pipe = &_dcd.pipe[0];
   const unsigned rem = pipe->remaining;
 
-  const unsigned mps = edpt0_max_packet_size();
-  const unsigned vld = RUSB2->CFIFOCTR_b.DTLN;
-  const unsigned len = TU_MIN(TU_MIN(rem, mps), vld);
+  const uint16_t mps = edpt0_max_packet_size(rusb);
+  const uint16_t vld = rusb->CFIFOCTR_b.DTLN;
+  const uint16_t len = tu_min16(tu_min16(rem, mps), vld);
   void          *buf = pipe->buf;
+
   if (len) {
     if (pipe->ff) {
-      pipe_read_write_packet_ff((tu_fifo_t*)buf, (volatile void*)&RUSB2->CFIFO, len, TUSB_DIR_OUT);
+      pipe_read_write_packet_ff((tu_fifo_t*)buf, (volatile void*)&rusb->CFIFO, len, TUSB_DIR_OUT);
     } else {
-      pipe_read_packet(buf, (volatile void*)&RUSB2->CFIFO, len);
+      pipe_read_packet(buf, (volatile void*)&rusb->CFIFO, len);
       pipe->buf = (uint8_t*)buf + len;
     }
   }
+
   if (len < mps) {
-    RUSB2->CFIFOCTR = RUSB2_CFIFOCTR_BCLR_Msk;
+    rusb->CFIFOCTR = RUSB2_CFIFOCTR_BCLR_Msk;
   }
+
   pipe->remaining = rem - len;
   if ((len < mps) || (rem == len)) {
     pipe->buf = NULL;
     return true;
   }
+
   return false;
 }
 
-static bool pipe_xfer_in(unsigned num)
+static bool pipe_xfer_in(rusb2_reg_t* rusb, unsigned num)
 {
   pipe_state_t  *pipe = &_dcd.pipe[num];
   const unsigned rem  = pipe->remaining;
@@ -348,119 +347,141 @@ static bool pipe_xfer_in(unsigned num)
     return true;
   }
 
-  RUSB2->D0FIFOSEL = num | RUSB2_FIFOSEL_MBW_16BIT | (TU_BYTE_ORDER == TU_BIG_ENDIAN ? RUSB2_FIFOSEL_BIGEND : 0);
-  const unsigned mps  = edpt_max_packet_size(num);
-  pipe_wait_for_ready(num);
-  const unsigned len  = TU_MIN(rem, mps);
+  rusb->D0FIFOSEL = num | RUSB2_FIFOSEL_MBW_16BIT | (TU_BYTE_ORDER == TU_BIG_ENDIAN ? RUSB2_FIFOSEL_BIGEND : 0);
+  const uint16_t mps  = edpt_max_packet_size(rusb, num);
+  pipe_wait_for_ready(rusb, num);
+  const uint16_t len  = tu_min16(rem, mps);
   void          *buf  = pipe->buf;
+
   if (len) {
     if (pipe->ff) {
-      pipe_read_write_packet_ff((tu_fifo_t*)buf, (volatile void*)&RUSB2->D0FIFO, len, TUSB_DIR_IN);
+      pipe_read_write_packet_ff((tu_fifo_t*)buf, (volatile void*)&rusb->D0FIFO, len, TUSB_DIR_IN);
     } else {
-      pipe_write_packet(buf, (volatile void*)&RUSB2->D0FIFO, len);
+      pipe_write_packet(buf, (volatile void*)&rusb->D0FIFO, len);
       pipe->buf = (uint8_t*)buf + len;
     }
   }
+
   if (len < mps) {
-    RUSB2->D0FIFOCTR = RUSB2_CFIFOCTR_BVAL_Msk;
+    rusb->D0FIFOCTR = RUSB2_CFIFOCTR_BVAL_Msk;
   }
-  RUSB2->D0FIFOSEL = 0;
-  while (RUSB2->D0FIFOSEL_b.CURPIPE) {} /* if CURPIPE bits changes, check written value */
+
+  rusb->D0FIFOSEL = 0;
+  while (rusb->D0FIFOSEL_b.CURPIPE) {} /* if CURPIPE bits changes, check written value */
+
   pipe->remaining = rem - len;
+
   return false;
 }
 
-static bool pipe_xfer_out(unsigned num)
+static bool pipe_xfer_out(rusb2_reg_t* rusb, unsigned num)
 {
   pipe_state_t  *pipe = &_dcd.pipe[num];
-  const unsigned rem  = pipe->remaining;
+  const uint16_t rem  = pipe->remaining;
 
-  RUSB2->D0FIFOSEL = num | RUSB2_FIFOSEL_MBW_8BIT;
-  const unsigned mps  = edpt_max_packet_size(num);
-  pipe_wait_for_ready(num);
-  const unsigned vld  = RUSB2->D0FIFOCTR_b.DTLN;
-  const unsigned len  = TU_MIN(TU_MIN(rem, mps), vld);
+  rusb->D0FIFOSEL = num | RUSB2_FIFOSEL_MBW_8BIT;
+  const uint16_t mps = edpt_max_packet_size(rusb, num);
+  pipe_wait_for_ready(rusb, num);
+
+  const uint16_t vld  = rusb->D0FIFOCTR_b.DTLN;
+  const uint16_t len  = tu_min16(tu_min16(rem, mps), vld);
   void          *buf  = pipe->buf;
+
   if (len) {
     if (pipe->ff) {
-      pipe_read_write_packet_ff((tu_fifo_t*)buf, (volatile void*)&RUSB2->D0FIFO, len, TUSB_DIR_OUT);
+      pipe_read_write_packet_ff((tu_fifo_t*)buf, (volatile void*)&rusb->D0FIFO, len, TUSB_DIR_OUT);
     } else {
-      pipe_read_packet(buf, (volatile void*)&RUSB2->D0FIFO, len);
+      pipe_read_packet(buf, (volatile void*)&rusb->D0FIFO, len);
       pipe->buf = (uint8_t*)buf + len;
     }
   }
+
   if (len < mps) {
-    RUSB2->D0FIFOCTR = RUSB2_CFIFOCTR_BCLR_Msk;
+    rusb->D0FIFOCTR = RUSB2_CFIFOCTR_BCLR_Msk;
   }
-  RUSB2->D0FIFOSEL = 0;
-  while (RUSB2->D0FIFOSEL_b.CURPIPE) {} /* if CURPIPE bits changes, check written value */
+
+  rusb->D0FIFOSEL = 0;
+  while (rusb->D0FIFOSEL_b.CURPIPE) {} /* if CURPIPE bits changes, check written value */
+
   pipe->remaining = rem - len;
   if ((len < mps) || (rem == len)) {
     pipe->buf = NULL;
     return NULL != buf;
   }
+
   return false;
 }
 
 static void process_setup_packet(uint8_t rhport)
 {
-  uint16_t setup_packet[4];
-  if (0 == (RUSB2->INTSTS0 & RUSB2_INTSTS0_VALID_Msk)) return;
-  RUSB2->CFIFOCTR = RUSB2_CFIFOCTR_BCLR_Msk;
-  setup_packet[0] = tu_le16toh(RUSB2->USBREQ);
-  setup_packet[1] = RUSB2->USBVAL;
-  setup_packet[2] = RUSB2->USBINDX;
-  setup_packet[3] = RUSB2->USBLENG;
-  RUSB2->INTSTS0 = ~((uint16_t)RUSB2_INTSTS0_VALID_Msk);
+  rusb2_reg_t* rusb = RUSB2_REG(rhport);
+  if (0 == (rusb->INTSTS0 & RUSB2_INTSTS0_VALID_Msk)) return;
+
+  rusb->CFIFOCTR = RUSB2_CFIFOCTR_BCLR_Msk;
+  uint16_t setup_packet[4] = {
+      tu_htole16(rusb->USBREQ),
+      tu_htole16(rusb->USBVAL),
+      tu_htole16(rusb->USBINDX),
+      tu_htole16(rusb->USBLENG)
+  };
+
+  rusb->INTSTS0 = ~((uint16_t) RUSB2_INTSTS0_VALID_Msk);
   dcd_event_setup_received(rhport, (const uint8_t*)&setup_packet[0], true);
 }
 
 static void process_status_completion(uint8_t rhport)
 {
+  rusb2_reg_t* rusb = RUSB2_REG(rhport);
   uint8_t ep_addr;
   /* Check the data stage direction */
-  if (RUSB2->CFIFOSEL & RUSB2_CFIFOSEL_ISEL_WRITE) {
+  if (rusb->CFIFOSEL & RUSB2_CFIFOSEL_ISEL_WRITE) {
     /* IN transfer. */
     ep_addr = tu_edpt_addr(0, TUSB_DIR_IN);
   } else {
     /* OUT transfer. */
     ep_addr = tu_edpt_addr(0, TUSB_DIR_OUT);
   }
+
   dcd_event_xfer_complete(rhport, ep_addr, 0, XFER_RESULT_SUCCESS, true);
 }
 
-static bool process_pipe0_xfer(int buffer_type, uint8_t ep_addr, void* buffer, uint16_t total_bytes)
+static bool process_pipe0_xfer(rusb2_reg_t* rusb, int buffer_type, uint8_t ep_addr, void* buffer, uint16_t total_bytes)
 {
   /* configure fifo direction and access unit settings */
-  if (ep_addr) { /* IN, 2 bytes */
-    RUSB2->CFIFOSEL = RUSB2_CFIFOSEL_ISEL_WRITE | RUSB2_FIFOSEL_MBW_16BIT |
-                         (TU_BYTE_ORDER == TU_BIG_ENDIAN ? RUSB2_FIFOSEL_BIGEND : 0);
-    while (!(RUSB2->CFIFOSEL & RUSB2_CFIFOSEL_ISEL_WRITE)) ;
-  } else { /* OUT, a byte */
-    RUSB2->CFIFOSEL = RUSB2_FIFOSEL_MBW_8BIT;
-    while (RUSB2->CFIFOSEL & RUSB2_CFIFOSEL_ISEL_WRITE) ;
+  if ( ep_addr ) {
+    /* IN, 2 bytes */
+    rusb->CFIFOSEL = RUSB2_CFIFOSEL_ISEL_WRITE | RUSB2_FIFOSEL_MBW_16BIT |
+                     (TU_BYTE_ORDER == TU_BIG_ENDIAN ? RUSB2_FIFOSEL_BIGEND : 0);
+    while ( !(rusb->CFIFOSEL & RUSB2_CFIFOSEL_ISEL_WRITE) ) {}
+  } else {
+    /* OUT, a byte */
+    rusb->CFIFOSEL = RUSB2_FIFOSEL_MBW_8BIT;
+    while ( rusb->CFIFOSEL & RUSB2_CFIFOSEL_ISEL_WRITE ) {}
   }
 
   pipe_state_t *pipe = &_dcd.pipe[0];
   pipe->ff        = buffer_type;
   pipe->length    = total_bytes;
   pipe->remaining = total_bytes;
-  if (total_bytes) {
-    pipe->buf     = buffer;
-    if (ep_addr) { /* IN */
-      TU_ASSERT(RUSB2->DCPCTR_b.BSTS && (RUSB2->USBREQ & 0x80));
-      pipe0_xfer_in();
+
+  if ( total_bytes ) {
+    pipe->buf = buffer;
+    if ( ep_addr ) {
+      /* IN */
+      TU_ASSERT(rusb->DCPCTR_b.BSTS && (rusb->USBREQ & 0x80));
+      pipe0_xfer_in(rusb);
     }
-    RUSB2->DCPCTR = RUSB2_PIPE_CTR_PID_BUF;
+    rusb->DCPCTR = RUSB2_PIPE_CTR_PID_BUF;
   } else {
     /* ZLP */
-    pipe->buf        = NULL;
-    RUSB2->DCPCTR = RUSB2_DCPCTR_CCPL_Msk | RUSB2_PIPE_CTR_PID_BUF;
+    pipe->buf = NULL;
+    rusb->DCPCTR = RUSB2_DCPCTR_CCPL_Msk | RUSB2_PIPE_CTR_PID_BUF;
   }
+
   return true;
 }
 
-static bool process_pipe_xfer(int buffer_type, uint8_t ep_addr, void* buffer, uint16_t total_bytes)
+static bool process_pipe_xfer(rusb2_reg_t* rusb, int buffer_type, uint8_t ep_addr, void* buffer, uint16_t total_bytes)
 {
   const unsigned epn = tu_edpt_number(ep_addr);
   const unsigned dir = tu_edpt_dir(ep_addr);
@@ -473,49 +494,55 @@ static bool process_pipe_xfer(int buffer_type, uint8_t ep_addr, void* buffer, ui
   pipe->buf       = buffer;
   pipe->length    = total_bytes;
   pipe->remaining = total_bytes;
-  if (dir) { /* IN */
+
+  if (dir) {
+    /* IN */
     if (total_bytes) {
-      pipe_xfer_in(num);
-    } else { /* ZLP */
-      RUSB2->D0FIFOSEL = num;
-      pipe_wait_for_ready(num);
-      RUSB2->D0FIFOCTR = RUSB2_CFIFOCTR_BVAL_Msk;
-      RUSB2->D0FIFOSEL = 0;
-      while (RUSB2->D0FIFOSEL_b.CURPIPE) ; /* if CURPIPE bits changes, check written value */
+      pipe_xfer_in(rusb, num);
+    } else {
+      /* ZLP */
+      rusb->D0FIFOSEL = num;
+      pipe_wait_for_ready(rusb, num);
+      rusb->D0FIFOCTR = RUSB2_CFIFOCTR_BVAL_Msk;
+      rusb->D0FIFOSEL = 0;
+      /* if CURPIPE bits changes, check written value */
+      while (rusb->D0FIFOSEL_b.CURPIPE) {}
     }
   } else {
-#if defined(__CCRX__)
-    __evenaccess volatile reg_pipetre_t *pt = get_pipetre(num);
-#else
-    volatile reg_pipetre_t *pt = get_pipetre(num);
-#endif
+    // OUT
+    volatile reg_pipetre_t *pt = get_pipetre(rusb, num);
+
     if (pt) {
-      const unsigned     mps = edpt_max_packet_size(num);
-      volatile uint16_t *ctr = get_pipectr(num);
+      const uint16_t     mps = edpt_max_packet_size(rusb, num);
+      volatile uint16_t *ctr = get_pipectr(rusb, num);
+
       if (*ctr & 0x3) *ctr = RUSB2_PIPE_CTR_PID_NAK;
+
       pt->TRE   = TU_BIT(8);
       pt->TRN   = (total_bytes + mps - 1) / mps;
       pt->TRENB = 1;
       *ctr = RUSB2_PIPE_CTR_PID_BUF;
     }
   }
-  //  TU_LOG1("X %x %d %d\r\n", ep_addr, total_bytes, buffer_type);
+
+  //  TU_LOG2("X %x %d %d\r\n", ep_addr, total_bytes, buffer_type);
   return true;
 }
 
-static bool process_edpt_xfer(int buffer_type, uint8_t ep_addr, void* buffer, uint16_t total_bytes)
+static bool process_edpt_xfer(rusb2_reg_t* rusb, int buffer_type, uint8_t ep_addr, void* buffer, uint16_t total_bytes)
 {
   const unsigned epn = tu_edpt_number(ep_addr);
   if (0 == epn) {
-    return process_pipe0_xfer(buffer_type, ep_addr, buffer, total_bytes);
+    return process_pipe0_xfer(rusb, buffer_type, ep_addr, buffer, total_bytes);
   } else {
-    return process_pipe_xfer(buffer_type, ep_addr, buffer, total_bytes);
+    return process_pipe_xfer(rusb, buffer_type, ep_addr, buffer, total_bytes);
   }
 }
 
 static void process_pipe0_bemp(uint8_t rhport)
 {
-  bool completed = pipe0_xfer_in();
+  rusb2_reg_t* rusb = RUSB2_REG(rhport);
+  bool completed = pipe0_xfer_in(rusb);
   if (completed) {
     pipe_state_t *pipe = &_dcd.pipe[0];
     dcd_event_xfer_complete(rhport, tu_edpt_addr(0, TUSB_DIR_IN),
@@ -525,17 +552,20 @@ static void process_pipe0_bemp(uint8_t rhport)
 
 static void process_pipe_brdy(uint8_t rhport, unsigned num)
 {
+  rusb2_reg_t* rusb = RUSB2_REG(rhport);
   pipe_state_t  *pipe = &_dcd.pipe[num];
   const unsigned dir  = tu_edpt_dir(pipe->ep);
   bool completed;
 
-  if (dir) { /* IN */
-    completed = pipe_xfer_in(num);
+  if (dir) {
+    /* IN */
+    completed = pipe_xfer_in(rusb, num);
   } else {
+    // OUT
     if (num) {
-      completed = pipe_xfer_out(num);
+      completed = pipe_xfer_out(rusb, num);
     } else {
-      completed = pipe0_xfer_out();
+      completed = pipe0_xfer_out(rusb);
     }
   }
   if (completed) {
@@ -606,8 +636,10 @@ static void process_bus_reset(uint8_t rhport)
 
 static void process_set_address(uint8_t rhport)
 {
-  const uint32_t addr = RUSB2->USBADDR & 0xFF;
+  rusb2_reg_t* rusb = RUSB2_REG(rhport);
+  const uint32_t addr = rusb->USBADDR & 0xFF;
   if (!addr) return;
+
   const tusb_control_request_t setup_packet = {
 #if defined(__CCRX__)
       .bmRequestType = { 0 },  /* Note: CCRX needs the braces over this struct member */
@@ -618,8 +650,9 @@ static void process_set_address(uint8_t rhport)
       .wValue        = addr,
       .wIndex        = 0,
       .wLength       = 0,
-    };
-  dcd_event_setup_received(rhport, (const uint8_t*)&setup_packet, true);
+  };
+
+  dcd_event_setup_received(rhport, (const uint8_t *) &setup_packet, true);
 }
 
 /*------------------------------------------------------------------*/
@@ -704,7 +737,7 @@ void dcd_init(uint8_t rhport)
   rusb->INTSTS0 = 0;
   rusb->INTENB0 = RUSB2_INTSTS0_VBINT_Msk | RUSB2_INTSTS0_BRDY_Msk | RUSB2_INTSTS0_BEMP_Msk |
                   RUSB2_INTSTS0_DVST_Msk | RUSB2_INTSTS0_CTRT_Msk | (USE_SOF ? RUSB2_INTSTS0_SOFR_Msk : 0) |
-                  RUSB2_INTSTS0_RESM_Msk | RUSB2_INTSTS0_NRDY_Msk;
+                  RUSB2_INTSTS0_RESM_Msk;
   rusb->BEMPENB = 1;
   rusb->BRDYENB = 1;
 
@@ -766,33 +799,43 @@ bool dcd_edpt_open(uint8_t rhport, tusb_desc_endpoint_t const * ep_desc)
 {
   (void)rhport;
 
+  rusb2_reg_t * rusb = RUSB2_REG(rhport);
   const unsigned ep_addr = ep_desc->bEndpointAddress;
   const unsigned epn     = tu_edpt_number(ep_addr);
   const unsigned dir     = tu_edpt_dir(ep_addr);
   const unsigned xfer    = ep_desc->bmAttributes.xfer;
 
   const unsigned mps = tu_edpt_packet_size(ep_desc);
-  if (xfer == TUSB_XFER_ISOCHRONOUS && mps > 256) {
-    /* USBa supports up to 256 bytes */
-    return false;
+
+  if (xfer == TUSB_XFER_ISOCHRONOUS) {
+    // Fullspeed ISO is limit to 256 bytes
+    if ( !is_highspeed(rhport) && mps > 256) {
+      return false;
+    }
   }
 
   const unsigned num = find_pipe(xfer);
-  if (!num) return false;
+  TU_ASSERT(num);
+
   _dcd.pipe[num].ep = ep_addr;
   _dcd.ep[dir][epn] = num;
 
   /* setup pipe */
   dcd_int_disable(rhport);
-  #if (CFG_TUSB_RHPORT1_MODE & OPT_MODE_DEVICE)
-  RUSB2->PIPEBUF = 0x7C08;
-  #endif
-  RUSB2->PIPESEL = num;
-  RUSB2->PIPEMAXP = mps;
-  volatile uint16_t *ctr = get_pipectr(num);
+
+  if ( is_highspeed(rhport) ) {
+    // FIXME shouldn't be after pipe selection and config, also the BUFNMB should be changed
+    // depending on the allocation scheme
+    rusb->PIPEBUF = 0x7C08;
+  }
+
+  rusb->PIPESEL = num;
+  rusb->PIPEMAXP = mps;
+  volatile uint16_t *ctr = get_pipectr(rusb, num);
   *ctr = RUSB2_PIPE_CTR_ACLRM_Msk | RUSB2_PIPE_CTR_SQCLR_Msk;
   *ctr = 0;
   unsigned cfg = (dir << 4) | epn;
+
   if (xfer == TUSB_XFER_BULK) {
     cfg |= (RUSB2_PIPECFG_TYPE_BULK | RUSB2_PIPECFG_SHTNAK_Msk | RUSB2_PIPECFG_DBLB_Msk);
   } else if (xfer == TUSB_XFER_INTERRUPT) {
@@ -800,13 +843,16 @@ bool dcd_edpt_open(uint8_t rhport, tusb_desc_endpoint_t const * ep_desc)
   } else {
     cfg |= (RUSB2_PIPECFG_TYPE_ISO | RUSB2_PIPECFG_DBLB_Msk);
   }
-  RUSB2->PIPECFG = cfg;
-  RUSB2->BRDYSTS = 0x1FFu ^ TU_BIT(num);
-  RUSB2->BRDYENB |= TU_BIT(num);
+
+  rusb->PIPECFG = cfg;
+  rusb->BRDYSTS = 0x1FFu ^ TU_BIT(num);
+  rusb->BRDYENB |= TU_BIT(num);
+
   if (dir || (xfer != TUSB_XFER_BULK)) {
     *ctr = RUSB2_PIPE_CTR_PID_BUF;
   }
-  // TU_LOG1("O %d %x %x\r\n", RUSB2->PIPESEL, RUSB2->PIPECFG, RUSB2->PIPEMAXP);
+
+  // TU_LOG1("O %d %x %x\r\n", rusb->PIPESEL, rusb->PIPECFG, rusb->PIPEMAXP);
   dcd_int_enable(rhport);
 
   return true;
@@ -826,26 +872,28 @@ void dcd_edpt_close_all(uint8_t rhport)
 
 void dcd_edpt_close(uint8_t rhport, uint8_t ep_addr)
 {
-  (void)rhport;
+  rusb2_reg_t * rusb = RUSB2_REG(rhport);
   const unsigned epn = tu_edpt_number(ep_addr);
   const unsigned dir = tu_edpt_dir(ep_addr);
   const unsigned num = _dcd.ep[dir][epn];
 
-  RUSB2->BRDYENB &= ~TU_BIT(num);
-  volatile uint16_t *ctr = get_pipectr(num);
+  rusb->BRDYENB &= ~TU_BIT(num);
+  volatile uint16_t *ctr = get_pipectr(rusb, num);
   *ctr = 0;
-  RUSB2->PIPESEL = num;
-  RUSB2->PIPECFG = 0;
+  rusb->PIPESEL = num;
+  rusb->PIPECFG = 0;
   _dcd.pipe[num].ep = 0;
   _dcd.ep[dir][epn] = 0;
 }
 
 bool dcd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t* buffer, uint16_t total_bytes)
 {
-  bool r;
+  rusb2_reg_t* rusb = RUSB2_REG(rhport);
+
   dcd_int_disable(rhport);
-  r = process_edpt_xfer(0, ep_addr, buffer, total_bytes);
+  bool r = process_edpt_xfer(rusb, 0, ep_addr, buffer, total_bytes);
   dcd_int_enable(rhport);
+
   return r;
 }
 
@@ -853,10 +901,12 @@ bool dcd_edpt_xfer_fifo(uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff, uint16_
 {
   // USB buffers always work in bytes so to avoid unnecessary divisions we demand item_size = 1
   TU_ASSERT(ff->item_size == 1);
-  bool r;
+  rusb2_reg_t* rusb = RUSB2_REG(rhport);
+
   dcd_int_disable(rhport);
-  r = process_edpt_xfer(1, ep_addr, ff, total_bytes);
+  bool r = process_edpt_xfer(rusb, 1, ep_addr, ff, total_bytes);
   dcd_int_enable(rhport);
+
   return r;
 }
 
@@ -873,8 +923,10 @@ void dcd_edpt_stall(uint8_t rhport, uint8_t ep_addr)
 
 void dcd_edpt_clear_stall(uint8_t rhport, uint8_t ep_addr)
 {
+  rusb2_reg_t * rusb = RUSB2_REG(rhport);
   volatile uint16_t *ctr = ep_addr_to_pipectr(rhport, ep_addr);
   if (!ctr) return;
+
   dcd_int_disable(rhport);
   *ctr = RUSB2_PIPE_CTR_SQCLR_Msk;
 
@@ -882,8 +934,8 @@ void dcd_edpt_clear_stall(uint8_t rhport, uint8_t ep_addr)
     *ctr = RUSB2_PIPE_CTR_PID_BUF;
   } else {
     const unsigned num = _dcd.ep[0][tu_edpt_number(ep_addr)];
-    RUSB2->PIPESEL = num;
-    if (RUSB2->PIPECFG_b.TYPE != 1) {
+    rusb->PIPESEL = num;
+    if (rusb->PIPECFG_b.TYPE != 1) {
       *ctr = RUSB2_PIPE_CTR_PID_BUF;
     }
   }
@@ -953,9 +1005,9 @@ void dcd_int_handler(uint8_t rhport)
     }
   }
 
-  if ( is0 & RUSB2_INTSTS0_NRDY_Msk ) {
-    rusb->NRDYSTS = 0;
-  }
+//  if ( is0 & RUSB2_INTSTS0_NRDY_Msk ) {
+//    rusb->NRDYSTS = 0;
+//  }
 
   // Control transfer stage changes
   if ( is0 & RUSB2_INTSTS0_CTRT_Msk ) {
@@ -970,7 +1022,7 @@ void dcd_int_handler(uint8_t rhport)
 
   // Buffer empty
   if ( is0 & RUSB2_INTSTS0_BEMP_Msk ) {
-    const unsigned s = rusb->BEMPSTS;
+    const uint16_t s = rusb->BEMPSTS;
     rusb->BEMPSTS = 0;
     if ( s & 1 ) {
       process_pipe0_bemp(rhport);
diff --git a/src/portable/renesas/rusb2/rusb2_rx.h b/src/portable/renesas/rusb2/rusb2_rx.h
index d7f4e0b42..21b2527c3 100644
--- a/src/portable/renesas/rusb2/rusb2_rx.h
+++ b/src/portable/renesas/rusb2/rusb2_rx.h
@@ -37,6 +37,8 @@ extern "C" {
 
 #define RUSB2_REG_BASE (0x000A0000)
 
+#define RUSB2_REG(_p)      ((rusb2_reg_t *) RUSB2_REG_BASE)
+
 // Start/Stop MSTP TODO implement later
 TU_ATTR_ALWAYS_INLINE static inline void rusb2_module_start(uint8_t rhport, bool start) {
   (void) rhport;
diff --git a/src/portable/renesas/rusb2/rusb2_type.h b/src/portable/renesas/rusb2/rusb2_type.h
index b704626f6..7a5e37089 100644
--- a/src/portable/renesas/rusb2/rusb2_type.h
+++ b/src/portable/renesas/rusb2/rusb2_type.h
@@ -33,6 +33,13 @@
 extern "C" {
 #endif
 
+// CCRX specific attribute to generate a Code that Accesses Variables in the Declared Size
+#ifdef __CCRX__
+  #define _ccrx_evenaccess __evenaccess
+#else
+  #define _ccrx_evenaccess
+#endif
+
 /*--------------------------------------------------------------------*/
 /* Register Definitions                                           */
 /*--------------------------------------------------------------------*/
@@ -64,7 +71,7 @@ typedef struct {
 
 
 /* RUSB2 Registers Structure */
-typedef struct {
+typedef struct _ccrx_evenaccess {
   union {
     volatile uint16_t SYSCFG; /* (@ 0x00000000) System Configuration Control Register */