add 12MHz crystal to library

hardware/lib/footprints/crystal_20MHz_txc_9C-12.000MAAJ-T.fp

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+# footprint for a SMT crystal HC-49S
+# manufacturer: TXC CORPORATION
+# part number: 9C-12.000MAAJ-T
+# datasheet: http://www.txccrystal.com/images/pdf/9c.pdf
+Element["" "HC-49S" "" "TXC 9C-12.000MAAJ-T" 0 0 0 0 0 100 ""]
+(
+ElementLine[-6.35mm -2.4mm 6.35mm -2.4mm 0.2mm]
+ElementLine[6.35mm -2.4mm 6.35mm 2.4mm 0.2mm]
+ElementLine[6.35mm 2.4mm -6.35mm 2.4mm 0.2mm]
+ElementLine[-6.35mm 2.4mm -6.35mm -2.4mm 0.2mm]
+Pad[-3.0mm 0.0mm -6.5mm 0.0mm 2.0mm 0.4mm 0.1mm "" "1" "square"]
+Pad[3.0mm 0.0mm 6.5mm 0.0mm 2.0mm 0.4mm 0.1mm "" "2" "square"]
+)

hardware/lib/footprints/crystal_20MHz_txc_9C-12.000MAAJ-T.rb

@@ -0,0 +1,43 @@
+#!/usr/bin/env ruby
+# encoding: utf-8
+# written for ruby 2.1.0
+# generate a footprint (see script for more information)
+require_relative 'element'
+
+# global dimensions
+UNIT = "mm"
+SILKSCREEN = 0.2
+SOLDERMASK = 0.1
+CLEARANCE = 0.4
+
+name = File.basename(__FILE__,".rb")+".fp"
+File.open(name,"w") do |fp|
+  # put some information
+  fp.puts "# footprint for a SMT crystal HC-49S"
+  fp.puts "# manufacturer: TXC CORPORATION"
+  fp.puts "# part number: 9C-12.000MAAJ-T"
+  fp.puts "# datasheet: http://www.txccrystal.com/images/pdf/9c.pdf"
+
+  # define element
+  # center is center of device
+  fp.puts element("Element",["","HC-49S","","TXC 9C-12.000MAAJ-T",:"0",:"0",:"0",:"0",:"0",:"100",""])
+  fp.puts "("
+
+  # outline
+  bottom = 4.8/2
+  top = -4.8/2
+  left = -12.7/2
+  right = 12.7/2
+  fp.puts element("ElementLine",[left,top,right,top,SILKSCREEN])
+  fp.puts element("ElementLine",[right,top,right,bottom,SILKSCREEN])
+  fp.puts element("ElementLine",[right,bottom,left,bottom,SILKSCREEN])
+  fp.puts element("ElementLine",[left,bottom,left,top,SILKSCREEN])
+
+  # pads
+  fp.puts element("Pad",[-4.0/2-2.0/2,0,-4.0/2-5.5+2.0/2,0,2.0,CLEARANCE,SOLDERMASK,"","1","square"])
+  fp.puts element("Pad",[4.0/2+2.0/2,0,4.0/2+5.5-2.0/2,0,2.0,CLEARANCE,SOLDERMASK,"","2","square"])
+
+  # end of element
+  fp.puts ")"
+end
+

hardware/lib/symbols/crystal_20MHz_txc_9C-12.000MAAJ-T.sym

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+v 20121203 2
+P 0 100 200 100 1 0 0
+{
+T 150 150 5 8 0 1 0 6 1
+pinnumber=1
+T 150 50 5 8 0 1 0 8 1
+pinseq=1
+T 250 100 9 8 0 1 0 0 1
+pinlabel=1
+T 250 100 5 8 0 1 0 2 1
+pintype=pas
+}
+P 500 100 700 100 1 0 1
+{
+T 550 150 5 8 0 1 0 0 1
+pinnumber=2
+T 550 50 5 8 0 1 0 2 1
+pinseq=2
+T 450 100 9 8 0 1 0 6 1
+pinlabel=2
+T 450 100 5 8 0 1 0 8 1
+pintype=pas
+}
+B 250 0 200 200 3 0 0 0 -1 -1 0 -1 -1 -1 -1 -1
+T 0 500 5 10 0 0 0 0 1
+device=CRYSTAL
+L 200 240 200 -40 3 0 0 0 -1 -1
+L 500 240 500 -40 3 0 0 0 -1 -1
+T 0 300 8 10 1 1 0 0 1
+refdes=Y?
+T 0 900 5 10 0 0 0 0 1
+description=12MHz, 18pF, 30ppm, SMT, HC49
+T 400 300 8 10 1 1 0 0 1
+value=12MHz
+T 0 700 8 10 0 0 0 0 1
+type=crystal
+T 0 1100 8 10 0 0 0 0 1
+manufacturer=TXC
+T 0 1300 8 10 0 0 0 0 1
+manufacturer-id=9C-12.000MAAJ-T
+T 0 1500 8 10 0 0 0 0 1
+datasheet=http://www.txccrystal.com/images/pdf/9c.pdf
+T 0 1700 8 10 0 0 0 0 1
+digikey-id=887-1053-2-ND
+T 0 1900 8 10 0 0 0 0 1
+farnell-id=1842280
+T 0 2100 8 10 0 0 0 0 1
+mouser-id=717-9C-12.000MAAJ-T
+T 0 2300 8 10 0 0 0 0 1
+footprint=crystal_20MHz_txc_9C-12.000MAAJ-T.fp