Fix README.md of hhkb
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V-USB controller for HHKB
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=========================
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Not supported actively any more.
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## Build
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Use `Makefile.vusb` for [V-USB] controller.
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$ make -f Makefile.vusb
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##Hardware
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###3. V-USB connection
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+---+ +---------------+
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USB GND | | ATmega328p |
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~~~ C3 | |
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5V <-------+--------+---|Vcc,AVCC | HHKB pro pro2
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R1 | | ~~~~~~~~ ~~~~
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D- <----+--+-----R2-----|INT1 PB2-4|------->ROW (6-8) (5-7)
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D+ <----|---+----R3-----|INT0 PC0-2|------->COL (9-11) (8-10)
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Z1 Z2 | PC3|------->ENABLE (12) (11)
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GND<----+---+-----------|GND PB0|<-------KEY (4) (3)
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| PB1|------->PREV (5) (4)
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GND+-C2--+--|XTAL1 RXD|------->Debug Console
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X1 | TXD|<-------Debug Console
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GND+-C3--+--|XTAL2 RST|---SW--+GND
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+---------------+
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R1: 1.5K Ohm
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R2,R3: 68 Ohm
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Z1,Z2: Zener 3.6V
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C1,C2: 22pF
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C3: 0.1uF
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X1: Crystal 12MHz
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SW: Push Switch(for bootloader)
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- NOTE: See [V-USB] documentation for more detail of hardware and the USB stack.
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- NOTE: [USBaspLoader] is very useful for firmware update.
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[V-USB]: http://www.obdev.at/products/vusb/index.html
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[USBaspLoader]: http://www.obdev.at/products/vusb/usbasploader.html
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