diff --git a/.github/workflows/build_esp.yml b/.github/workflows/build_esp.yml
index 08bb4f5d2..93d582361 100644
--- a/.github/workflows/build_esp.yml
+++ b/.github/workflows/build_esp.yml
@@ -16,7 +16,6 @@ jobs:
         board:
         # Alphabetical order
         # ESP32-S2
-        - 'adafruit_metro_esp32s2'
         - 'espressif_saola_1'
         # ESP32-S3
         - 'espressif_addax_1'
diff --git a/.github/workflows/build_renesas.yml b/.github/workflows/build_renesas.yml
index 45e0c5fd5..ee9ba8289 100644
--- a/.github/workflows/build_renesas.yml
+++ b/.github/workflows/build_renesas.yml
@@ -15,7 +15,7 @@ jobs:
       matrix:
         family:
         # Alphabetical order
-        - 'rx63n'
+        - 'rx'
     steps:
     - name: Setup Python
       uses: actions/setup-python@v2
diff --git a/README.md b/README.md
index bea6d0d49..9b86e3b27 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ The stack supports the following MCUs:
   - Kinetis: KL25
   - LPC Series: 11u, 13, 15, 17, 18, 40, 43, 51u, 54, 55
 - **Raspberry Pi:** RP2040
-- **Renesas:** RX63N
+- **Renesas:** RX63N, RX65N
 - **Silabs:** EFM32GG12
 - **Sony:** CXD56
 - **ST:** STM32 series: L0, F0, F1, F2, F3, F4, F7, H7 both FullSpeed and HighSpeed
diff --git a/docs/boards.md b/docs/boards.md
index ebba1f841..c790c7967 100644
--- a/docs/boards.md
+++ b/docs/boards.md
@@ -126,6 +126,7 @@ This code base already had supported for a handful of following boards (sorted a
 ### Renesas RX
 
 - [GR-CITRUS](https://www.renesas.com/us/en/products/gadget-renesas/boards/gr-citrus)
+- [Renesas RX65N Cloud Kit](https://www.renesas.com/us/en/products/microcontrollers-microprocessors/rx-32-bit-performance-efficiency-mcus/rx65n-cloud-kit-renesas-rx65n-cloud-kit)
 
 ### Raspberry Pi RP2040
 
diff --git a/examples/device/cdc_msc_freertos/src/freertos_hook.c b/examples/device/cdc_msc_freertos/src/freertos_hook.c
index 273ad46e6..ab885947c 100644
--- a/examples/device/cdc_msc_freertos/src/freertos_hook.c
+++ b/examples/device/cdc_msc_freertos/src/freertos_hook.c
@@ -94,7 +94,7 @@ void vApplicationGetTimerTaskMemory( StaticTask_t **ppxTimerTaskTCBBuffer, Stack
   *pulTimerTaskStackSize = configTIMER_TASK_STACK_DEPTH;
 }
 
-#if CFG_TUSB_MCU == OPT_MCU_RX63X
+#if CFG_TUSB_MCU == OPT_MCU_RX63X | CFG_TUSB_MCU == OPT_MCU_RX65X
 #include "iodefine.h"
 void vApplicationSetupTimerInterrupt(void)
 {
diff --git a/examples/device/hid_composite_freertos/src/freertos_hook.c b/examples/device/hid_composite_freertos/src/freertos_hook.c
index 273ad46e6..ab885947c 100644
--- a/examples/device/hid_composite_freertos/src/freertos_hook.c
+++ b/examples/device/hid_composite_freertos/src/freertos_hook.c
@@ -94,7 +94,7 @@ void vApplicationGetTimerTaskMemory( StaticTask_t **ppxTimerTaskTCBBuffer, Stack
   *pulTimerTaskStackSize = configTIMER_TASK_STACK_DEPTH;
 }
 
-#if CFG_TUSB_MCU == OPT_MCU_RX63X
+#if CFG_TUSB_MCU == OPT_MCU_RX63X | CFG_TUSB_MCU == OPT_MCU_RX65X
 #include "iodefine.h"
 void vApplicationSetupTimerInterrupt(void)
 {
diff --git a/hw/bsp/board_mcu.h b/hw/bsp/board_mcu.h
index f8e89ad04..9f6b489ea 100644
--- a/hw/bsp/board_mcu.h
+++ b/hw/bsp/board_mcu.h
@@ -127,7 +127,7 @@
 #elif CFG_TUSB_MCU == OPT_MCU_EFM32GG || CFG_TUSB_MCU == OPT_MCU_EFM32GG11 || CFG_TUSB_MCU == OPT_MCU_EFM32GG12
   #include "em_device.h"
 
-#elif CFG_TUSB_MCU == OPT_MCU_RX63X
+#elif CFG_TUSB_MCU == OPT_MCU_RX63X || CFG_TUSB_MCU == OPT_MCU_RX65X
   // no header needed
 
 #else
diff --git a/hw/bsp/rx/boards/gr_citrus/board.mk b/hw/bsp/rx/boards/gr_citrus/board.mk
new file mode 100644
index 000000000..0eba94610
--- /dev/null
+++ b/hw/bsp/rx/boards/gr_citrus/board.mk
@@ -0,0 +1,24 @@
+DEPS_SUBMODULES += hw/mcu/renesas/rx
+
+CFLAGS += \
+  -mcpu=rx610 \
+  -misa=v1 \
+  -DCFG_TUSB_MCU=OPT_MCU_RX63X
+
+MCU_DIR = hw/mcu/renesas/rx/rx63n
+
+# All source paths should be relative to the top level.
+LD_FILE = $(BOARD_PATH)/r5f5631fd.ld
+
+# For freeRTOS port source
+FREERTOS_PORT = RX600
+
+# For flash-jlink target
+JLINK_DEVICE = R5F5631F
+JLINK_IF     = JTAG
+
+# For flash-pyocd target
+PYOCD_TARGET =
+
+# flash using jlink
+flash: flash-jlink
diff --git a/hw/bsp/rx63n/boards/gr_citrus/gr_citrus.c b/hw/bsp/rx/boards/gr_citrus/gr_citrus.c
similarity index 100%
rename from hw/bsp/rx63n/boards/gr_citrus/gr_citrus.c
rename to hw/bsp/rx/boards/gr_citrus/gr_citrus.c
diff --git a/hw/bsp/rx63n/boards/gr_citrus/hwinit.c b/hw/bsp/rx/boards/gr_citrus/hwinit.c
similarity index 100%
rename from hw/bsp/rx63n/boards/gr_citrus/hwinit.c
rename to hw/bsp/rx/boards/gr_citrus/hwinit.c
diff --git a/hw/bsp/rx63n/boards/gr_citrus/r5f5631fd.ld b/hw/bsp/rx/boards/gr_citrus/r5f5631fd.ld
similarity index 100%
rename from hw/bsp/rx63n/boards/gr_citrus/r5f5631fd.ld
rename to hw/bsp/rx/boards/gr_citrus/r5f5631fd.ld
diff --git a/hw/bsp/rx/boards/rx65n_cloud_kit/board.mk b/hw/bsp/rx/boards/rx65n_cloud_kit/board.mk
new file mode 100644
index 000000000..fc76d79fa
--- /dev/null
+++ b/hw/bsp/rx/boards/rx65n_cloud_kit/board.mk
@@ -0,0 +1,25 @@
+CFLAGS += \
+  -mcpu=rx64m \
+  -misa=v2 \
+  -DCFG_TUSB_MCU=OPT_MCU_RX65X \
+  -DIR_USB0_USBI0=IR_PERIB_INTB185 \
+  -DIER_USB0_USBI0=IER_PERIB_INTB185 \
+  -DIEN_USB0_USBI0=IEN_PERIB_INTB185
+
+MCU_DIR = hw/mcu/renesas/rx/rx65n
+
+# All source paths should be relative to the top level.
+LD_FILE = $(BOARD_PATH)/r5f565ne.ld
+
+# For freeRTOS port source
+FREERTOS_PORT = RX600
+
+# For flash-jlink target
+JLINK_DEVICE = R5F565NE
+JLINK_IF     = JTAG
+
+# For flash-pyocd target
+PYOCD_TARGET =
+
+# flash using rfp-cli
+flash: flash-rfp
diff --git a/hw/bsp/rx/boards/rx65n_cloud_kit/r5f565ne.ld b/hw/bsp/rx/boards/rx65n_cloud_kit/r5f565ne.ld
new file mode 100644
index 000000000..a02f0c02f
--- /dev/null
+++ b/hw/bsp/rx/boards/rx65n_cloud_kit/r5f565ne.ld
@@ -0,0 +1,168 @@
+__USTACK_SIZE = 0x00000200;
+__ISTACK_SIZE = 0x00000200;
+
+MEMORY
+{
+	RAM  : ORIGIN = 0x4,        LENGTH = 0x3fffc
+	RAM2 : ORIGIN = 0x00800000, LENGTH = 0x60000
+	OFS  : ORIGIN = 0xFE7F5D00, LENGTH = 128
+	ROM  : ORIGIN = 0xFFE00000, LENGTH = 0x200000
+}
+SECTIONS
+{
+	.exvectors 0xFFFFFF80: AT(0xFFFFFF80)
+	{
+		"_exvectors_start" = .;
+		KEEP(*(.exvectors))
+		"_exvectors_end" = .;
+	} >ROM
+	.fvectors 0xFFFFFFFC: AT(0xFFFFFFFC)
+	{
+		KEEP(*(.fvectors))
+	} > ROM
+	.text 0xFFE00000: AT(0xFFE00000)
+	{
+		*(.text)
+		*(.text.*)
+		*(P)
+		KEEP(*(.text.*_isr))
+		etext = .;
+	} > ROM
+	.rvectors ALIGN(4):
+	{
+		_rvectors_start = .;
+		KEEP(*(.rvectors))
+		_rvectors_end = .;
+	} > ROM
+	.init :
+	{
+		KEEP(*(.init))
+		__preinit_array_start = .;
+		KEEP(*(.preinit_array))
+		__preinit_array_end = .;
+		__init_array_start = (. + 3) & ~ 3;
+		KEEP(*(.init_array))
+		KEEP(*(SORT(.init_array.*)))
+		__init_array_end = .;
+		__fini_array_start = .;
+		KEEP(*(.fini_array))
+		KEEP(*(SORT(.fini_array.*)))
+		__fini_array_end = .;
+	} > ROM
+	.fini :
+	{
+		KEEP(*(.fini))
+	} > ROM
+	.got :
+	{
+		*(.got)
+		*(.got.plt)
+	} > ROM
+	.rodata :
+	{
+		*(.rodata)
+		*(.rodata.*)
+		*(C_1)
+		*(C_2)
+		*(C)
+		_erodata = .;
+	} > ROM
+	.eh_frame_hdr :
+	{
+		*(.eh_frame_hdr)
+	} > ROM
+	.eh_frame :
+	{
+		*(.eh_frame)
+	} > ROM
+	.jcr :
+	{
+		*(.jcr)
+	} > ROM
+	.tors :
+	{
+		__CTOR_LIST__ = .;
+		. = ALIGN(2);
+		___ctors = .;
+		*(.ctors)
+		___ctors_end = .;
+		__CTOR_END__ = .;
+		__DTOR_LIST__ = .;
+		___dtors = .;
+		*(.dtors)
+		___dtors_end = .;
+		__DTOR_END__ = .;
+		. = ALIGN(2);
+		_mdata = .;
+	} > ROM
+	.data : AT(_mdata)
+	{
+		_data = .;
+		*(.data)
+		*(.data.*)
+		*(D)
+		*(D_1)
+		*(D_2)
+		_edata = .;
+	} > RAM
+	.gcc_exc :
+	{
+		*(.gcc_exc)
+	} > RAM
+	.bss :
+	{
+		_bss = .;
+		*(.bss)
+		*(.bss.**)
+		*(COMMON)
+		*(B)
+		*(B_1)
+		*(B_2)
+		_ebss = .;
+		_end = .;
+	} > RAM
+	.ustack :
+	{
+		. = ALIGN(8);
+		. = . + __USTACK_SIZE;
+		PROVIDE(_ustack = .);
+	} > RAM
+	.istack :
+	{
+		. = ALIGN(8);
+		. = . + __ISTACK_SIZE;
+		PROVIDE(_istack = .);
+	} > RAM
+	.ofs1 0xFE7F5D00: AT(0xFE7F5D00)
+	{
+		KEEP(*(.ofs1))
+	} > OFS
+	.ofs2 0xFE7F5D10: AT(0xFE7F5D10)
+	{
+		KEEP(*(.ofs2))
+	} > OFS
+	.ofs3 0xFE7F5D20: AT(0xFE7F5D20)
+	{
+		KEEP(*(.ofs3))
+	} > OFS
+	.ofs4 0xFE7F5D40: AT(0xFE7F5D40)
+	{
+		KEEP(*(.ofs4))
+	} > OFS
+	.ofs5 0xFE7F5D48: AT(0xFE7F5D48)
+	{
+		KEEP(*(.ofs5))
+	} > OFS
+	.ofs6 0xFE7F5D50: AT(0xFE7F5D50)
+	{
+		KEEP(*(.ofs6))
+	} > OFS
+	.ofs7 0xFE7F5D64: AT(0xFE7F5D64)
+	{
+		KEEP(*(.ofs7))
+	} > OFS
+	.ofs8 0xFE7F5D70: AT(0xFE7F5D70)
+	{
+		KEEP(*(.ofs8))
+	} > OFS
+}
diff --git a/hw/bsp/rx/boards/rx65n_cloud_kit/rx65n_cloud_kit.c b/hw/bsp/rx/boards/rx65n_cloud_kit/rx65n_cloud_kit.c
new file mode 100644
index 000000000..895b82e23
--- /dev/null
+++ b/hw/bsp/rx/boards/rx65n_cloud_kit/rx65n_cloud_kit.c
@@ -0,0 +1,270 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021, Koji Kitayama
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#include "bsp/board.h"
+#include "iodefine.h"
+#include "interrupt_handlers.h"
+
+#define IRQ_PRIORITY_CMT0     5
+#define IRQ_PRIORITY_USBI0    6
+#define IRQ_PRIORITY_SCI5     5
+
+#define SYSTEM_PRCR_PRC1      (1<<1)
+#define SYSTEM_PRCR_PRKEY     (0xA5u<<8)
+
+#define CMT_PCLK              60000000
+#define CMT_CMCR_CKS_DIV_128  2
+#define CMT_CMCR_CMIE         (1<<6)
+#define MPC_PFS_ISEL          (1<<6)
+
+#define SCI_PCLK              60000000
+#define SCI_SSR_FER           (1<<4)
+#define SCI_SSR_ORER          (1<<5)
+
+#define SCI_SCR_TEIE          (1u<<2)
+#define SCI_SCR_RE            (1u<<4)
+#define SCI_SCR_TE            (1u<<5)
+#define SCI_SCR_RIE           (1u<<6)
+#define SCI_SCR_TIE           (1u<<7)
+#define INT_Excep_SCI5_TEI5   INT_Excep_ICU_GROUPBL0
+
+#define IRQ_USB0_USBI0        62
+#define SLIBR_USBI0           SLIBR185
+#define IPR_USB0_USBI0        IPR_PERIB_INTB185
+#define INT_Excep_USB0_USBI0  INT_Excep_PERIB_INTB185
+
+void HardwareSetup(void)
+{
+  FLASH.ROMCIV.WORD = 1;
+  while (FLASH.ROMCIV.WORD) ;
+  FLASH.ROMCE.WORD = 1;
+  while (!FLASH.ROMCE.WORD) ;
+
+  SYSTEM.PRCR.WORD = 0xA503u;
+  if (!SYSTEM.RSTSR1.BYTE) {
+    RTC.RCR4.BYTE = 0;
+    RTC.RCR3.BYTE = 12;
+    while (12 != RTC.RCR3.BYTE) ;
+  }
+  SYSTEM.SOSCCR.BYTE = 1;
+
+  if (SYSTEM.HOCOCR.BYTE) {
+    SYSTEM.HOCOCR.BYTE = 0;
+    while (!SYSTEM.OSCOVFSR.BIT.HCOVF) ;
+  }
+  SYSTEM.PLLCR.WORD  = 0x1D10u; /* HOCO x 15 */
+  SYSTEM.PLLCR2.BYTE = 0;
+  while (!SYSTEM.OSCOVFSR.BIT.PLOVF) ;
+
+  SYSTEM.SCKCR.LONG  = 0x21C11222u;
+  SYSTEM.SCKCR2.WORD = 0x0041u;
+  SYSTEM.ROMWT.BYTE  = 0x02u;
+  while (0x02u != SYSTEM.ROMWT.BYTE) ;
+  SYSTEM.SCKCR3.WORD = 0x400u;
+  SYSTEM.PRCR.WORD   = 0xA500u;
+}
+
+//--------------------------------------------------------------------+
+// SCI handling
+//--------------------------------------------------------------------+
+typedef struct {
+  uint8_t *buf;
+  uint32_t cnt;
+} sci_buf_t;
+static volatile sci_buf_t sci_buf[2];
+
+void INT_Excep_SCI5_TXI5(void)
+{
+  uint8_t *buf = sci_buf[0].buf;
+  uint32_t cnt = sci_buf[0].cnt;
+  
+  if (!buf || !cnt) {
+    SCI5.SCR.BYTE &= ~(SCI_SCR_TEIE | SCI_SCR_TE | SCI_SCR_TIE);
+    return;
+  }
+  SCI5.TDR = *buf;
+  if (--cnt) {
+    ++buf;
+  } else {
+    buf = NULL;
+    SCI5.SCR.BIT.TIE  = 0;
+    SCI5.SCR.BIT.TEIE = 1;
+  }
+  sci_buf[0].buf = buf;
+  sci_buf[0].cnt = cnt;
+}
+
+void INT_Excep_SCI5_TEI5(void)
+{
+  SCI5.SCR.BYTE &= ~(SCI_SCR_TEIE | SCI_SCR_TE | SCI_SCR_TIE);
+}
+
+void INT_Excep_SCI5_RXI5(void)
+{
+  uint8_t *buf = sci_buf[1].buf;
+  uint32_t cnt = sci_buf[1].cnt;
+
+  if (!buf || !cnt ||
+      (SCI5.SSR.BYTE & (SCI_SSR_FER | SCI_SSR_ORER))) {
+    sci_buf[1].buf = NULL;
+    SCI5.SSR.BYTE   = 0;
+    SCI5.SCR.BYTE  &= ~(SCI_SCR_RE | SCI_SCR_RIE);
+    return;
+  }
+  *buf = SCI5.RDR;
+  if (--cnt) {
+    ++buf;
+  } else {
+    buf = NULL;
+    SCI5.SCR.BYTE &= ~(SCI_SCR_RE | SCI_SCR_RIE);
+  }
+  sci_buf[1].buf = buf;
+  sci_buf[1].cnt = cnt;
+}
+
+//--------------------------------------------------------------------+
+// Forward USB interrupt events to TinyUSB IRQ Handler
+//--------------------------------------------------------------------+
+void INT_Excep_USB0_USBI0(void)
+{
+  tud_int_handler(0);
+}
+
+void board_init(void)
+{
+  /* setup software configurable interrupts */
+  ICU.SLIBR_USBI0.BYTE = IRQ_USB0_USBI0;
+  ICU.SLIPRCR.BYTE     = 1;
+
+#if CFG_TUSB_OS == OPT_OS_NONE
+  /* Enable CMT0 */
+  SYSTEM.PRCR.WORD = SYSTEM_PRCR_PRKEY | SYSTEM_PRCR_PRC1;
+  MSTP(CMT0)       = 0;
+  SYSTEM.PRCR.WORD = SYSTEM_PRCR_PRKEY;
+  /* Setup 1ms tick timer */
+  CMT0.CMCNT      = 0;
+  CMT0.CMCOR      = CMT_PCLK / 1000 / 128;
+  CMT0.CMCR.WORD  = CMT_CMCR_CMIE | CMT_CMCR_CKS_DIV_128;
+  IR(CMT0, CMI0)  = 0;
+  IPR(CMT0, CMI0) = IRQ_PRIORITY_CMT0;
+  IEN(CMT0, CMI0) = 1;
+  CMT.CMSTR0.BIT.STR0 = 1;
+#endif
+
+  /* Unlock MPC registers */
+  MPC.PWPR.BIT.B0WI  = 0;
+  MPC.PWPR.BIT.PFSWE = 1;
+  // SW PB1
+  PORTB.PMR.BIT.B1 = 0U;
+  PORTB.PDR.BIT.B1 = 0U;
+  // LED PD6
+  PORTD.PODR.BIT.B6 = 1U;
+  PORTD.ODR1.BIT.B4 = 1U;
+  PORTD.PMR.BIT.B6  = 0U;
+  PORTD.PDR.BIT.B6  = 1U;
+  /* UART TXD5 => PA4, RXD5 => PA3 */
+  PORTA.PMR.BIT.B4 = 1U;
+  PORTA.PCR.BIT.B4 = 1U;
+  MPC.PA4PFS.BYTE  = 0b01010;
+  PORTA.PMR.BIT.B3 = 1U;
+  MPC.PA5PFS.BYTE  = 0b01010;
+  /* USB VBUS -> P16 */
+  PORT1.PMR.BIT.B6 = 1U;
+  MPC.P16PFS.BYTE  = MPC_PFS_ISEL | 0b10001;
+  /* Lock MPC registers */
+  MPC.PWPR.BIT.PFSWE = 0;
+  MPC.PWPR.BIT.B0WI  = 1;
+
+  /* Enable SCI5 */
+  SYSTEM.PRCR.WORD   = SYSTEM_PRCR_PRKEY | SYSTEM_PRCR_PRC1;
+  MSTP(SCI5)         = 0;
+  SYSTEM.PRCR.WORD   = SYSTEM_PRCR_PRKEY;
+  SCI5.SEMR.BIT.ABCS = 1;
+  SCI5.SEMR.BIT.BGDM = 1;
+  SCI5.BRR           = (SCI_PCLK / (8 * 115200)) - 1;
+  IR(SCI5,  RXI5)    = 0;
+  IR(SCI5,  TXI5)    = 0;
+  IS(SCI5,  TEI5)    = 0;
+  IR(ICU, GROUPBL0)  = 0;
+  IPR(SCI5, RXI5)    = IRQ_PRIORITY_SCI5;
+  IPR(SCI5, TXI5)    = IRQ_PRIORITY_SCI5;
+  IPR(ICU,GROUPBL0)  = IRQ_PRIORITY_SCI5;
+  IEN(SCI5, RXI5)    = 1;
+  IEN(SCI5, TXI5)    = 1;
+  IEN(ICU,GROUPBL0)  = 1;
+  EN(SCI5, TEI5)     = 1;
+
+  /* setup USBI0 interrupt. */
+  IR(USB0, USBI0)  = 0;
+  IPR(USB0, USBI0) = IRQ_PRIORITY_USBI0;
+}
+
+//--------------------------------------------------------------------+
+// Board porting API
+//--------------------------------------------------------------------+
+
+void board_led_write(bool state)
+{
+  PORTD.PODR.BIT.B6 = state ? 0 : 1;
+}
+
+uint32_t board_button_read(void)
+{
+  return PORTB.PIDR.BIT.B1 ? 0 : 1;
+}
+
+int board_uart_read(uint8_t* buf, int len)
+{
+  sci_buf[1].buf = buf;
+  sci_buf[1].cnt = len;
+  SCI5.SCR.BYTE |= SCI_SCR_RE | SCI_SCR_RIE;
+  while (SCI5.SCR.BIT.RE) ;
+  return len - sci_buf[1].cnt;
+}
+
+int board_uart_write(void const *buf, int len)
+{
+  sci_buf[0].buf = (uint8_t*)buf;
+  sci_buf[0].cnt = len;
+  SCI5.SCR.BYTE |= SCI_SCR_TE | SCI_SCR_TIE;
+  while (SCI5.SCR.BIT.TE) ;
+  return len;
+}
+
+#if CFG_TUSB_OS == OPT_OS_NONE
+volatile uint32_t system_ticks = 0;
+void INT_Excep_CMT0_CMI0(void)
+{
+  ++system_ticks;
+}
+
+uint32_t board_millis(void)
+{
+  return system_ticks;
+}
+#else
+uint32_t SystemCoreClock = 120000000;
+#endif
diff --git a/hw/bsp/rx/family.mk b/hw/bsp/rx/family.mk
new file mode 100644
index 000000000..7d7585b4a
--- /dev/null
+++ b/hw/bsp/rx/family.mk
@@ -0,0 +1,50 @@
+DEPS_SUBMODULES += hw/mcu/renesas/rx
+
+# Cross Compiler for RX
+CROSS_COMPILE = rx-elf-
+
+include $(TOP)/$(BOARD_PATH)/board.mk
+
+CFLAGS += \
+  -nostartfiles \
+  -ffunction-sections \
+  -fdata-sections \
+  -fshort-enums \
+  -mlittle-endian-data \
+
+RX_NEWLIB ?= 1
+
+ifeq ($(CMDEXE),1)
+  OPTLIBINC="$(shell for /F "usebackq delims=" %%i in (`where rx-elf-gcc`) do echo %%~dpi..\rx-elf\optlibinc)"
+else
+  OPTLIBINC=$(shell dirname `which rx-elf-gcc`)../rx-elf/optlibinc
+endif
+
+ifeq ($(RX_NEWLIB),1)
+  CFLAGS += -DSSIZE_MAX=__INT_MAX__
+else
+  # setup for optlib
+  CFLAGS += -nostdinc \
+    -isystem $(OPTLIBINC) \
+    -DLWIP_NO_INTTYPES_H
+
+  LIBS += -loptc -loptm
+endif
+
+SRC_C += \
+	src/portable/renesas/usba/dcd_usba.c \
+	$(MCU_DIR)/vects.c
+
+INC += \
+	$(TOP)/$(BOARD_PATH) \
+	$(TOP)/$(MCU_DIR)
+
+SRC_S += $(MCU_DIR)/start.S
+
+$(BUILD)/$(PROJECT).mot: $(BUILD)/$(PROJECT).elf
+	@echo CREATE $@
+	$(OBJCOPY) -O srec -I elf32-rx-be-ns $^ $@
+
+# flash using rfp-cli
+flash-rfp: $(BUILD)/$(PROJECT).mot
+	rfp-cli -device rx65x -tool e2l -if fine -fo id FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF -auth id FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF -auto $^
diff --git a/hw/bsp/rx63n/boards/gr_citrus/board.mk b/hw/bsp/rx63n/boards/gr_citrus/board.mk
deleted file mode 100644
index feab5b5e6..000000000
--- a/hw/bsp/rx63n/boards/gr_citrus/board.mk
+++ /dev/null
@@ -1,61 +0,0 @@
-DEPS_SUBMODULES += hw/mcu/renesas/rx
-
-CFLAGS += \
-  -nostartfiles \
-  -ffunction-sections \
-  -fdata-sections \
-  -fshort-enums \
-  -mcpu=rx610 \
-  -misa=v1 \
-  -mlittle-endian-data \
-  -DCFG_TUSB_MCU=OPT_MCU_RX63X
-
-# Cross Compiler for RX
-CROSS_COMPILE = rx-elf-
-
-RX_NEWLIB ?= 1
-
-ifeq ($(CMDEXE),1)
-OPTLIBINC="$(shell for /F "usebackq delims=" %%i in (`where rx-elf-gcc`) do echo %%~dpi..\rx-elf\optlibinc)"
-else
-OPTLIBINC=$(shell dirname `which rx-elf-gcc`)../rx-elf/optlibinc
-endif
-
-ifeq ($(RX_NEWLIB),1)
-CFLAGS += -DSSIZE_MAX=__INT_MAX__
-else
-# setup for optlib
-CFLAGS += -nostdinc \
-  -isystem $(OPTLIBINC) \
-  -DLWIP_NO_INTTYPES_H
-
-LIBS += -loptc -loptm
-endif
-
-MCU_DIR = hw/mcu/renesas/rx/rx63n
-
-# All source paths should be relative to the top level.
-LD_FILE = $(BOARD_PATH)/r5f5631fd.ld
-
-SRC_C += \
-	src/portable/renesas/usba/dcd_usba.c \
-	$(MCU_DIR)/vects.c
-
-INC += \
-	$(TOP)/$(BOARD_PATH) \
-	$(TOP)/$(MCU_DIR)
-
-SRC_S += $(MCU_DIR)/start.S
-
-# For freeRTOS port source
-FREERTOS_PORT = RX600
-
-# For flash-jlink target
-JLINK_DEVICE = R5F5631F
-JLINK_IF     = JTAG
-
-# For flash-pyocd target
-PYOCD_TARGET =
-
-# flash using jlink
-flash: flash-jlink
diff --git a/hw/bsp/rx63n/family.mk b/hw/bsp/rx63n/family.mk
deleted file mode 100644
index d3c743ed1..000000000
--- a/hw/bsp/rx63n/family.mk
+++ /dev/null
@@ -1 +0,0 @@
-include $(TOP)/$(BOARD_PATH)/board.mk
\ No newline at end of file
diff --git a/hw/mcu/renesas/rx b/hw/mcu/renesas/rx
index 4a51dfe6e..706b4e0cf 160000
--- a/hw/mcu/renesas/rx
+++ b/hw/mcu/renesas/rx
@@ -1 +1 @@
-Subproject commit 4a51dfe6ecdf936d2d89f223f069e24a2d109207
+Subproject commit 706b4e0cf485605c32351e2f90f5698267996023
diff --git a/src/portable/renesas/usba/dcd_usba.c b/src/portable/renesas/usba/dcd_usba.c
index 06ea1a3f9..de3e0e312 100644
--- a/src/portable/renesas/usba/dcd_usba.c
+++ b/src/portable/renesas/usba/dcd_usba.c
@@ -26,8 +26,8 @@
 
 #include "tusb_option.h"
 
-#if TUSB_OPT_DEVICE_ENABLED && ( CFG_TUSB_MCU == OPT_MCU_RX63X )
-
+#if TUSB_OPT_DEVICE_ENABLED && ( CFG_TUSB_MCU == OPT_MCU_RX63X || \
+                                 CFG_TUSB_MCU == OPT_MCU_RX65X)
 #include "device/dcd.h"
 #include "iodefine.h"
 
diff --git a/src/tusb_option.h b/src/tusb_option.h
index 815e588de..bf7591dcf 100644
--- a/src/tusb_option.h
+++ b/src/tusb_option.h
@@ -113,6 +113,7 @@
 
 // Renesas RX
 #define OPT_MCU_RX63X            1400 ///< Renesas RX63N/631
+#define OPT_MCU_RX65X            1401 ///< Renesas RX65N/RX651
 
 // Mind Motion
 #define OPT_MCU_MM32F327X        1500 ///< Mind Motion MM32F327