94 lines
2.9 KiB
Text
94 lines
2.9 KiB
Text
Panasonic VP-0187A
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==================
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2017/08/06
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It is unknown keyboard from Panasonic with Hirose Cherry M8 and 6P6C connector.
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Pictures:
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http://imgur.com/a/GAZE7
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Hirose Cheery M8 switches:
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https://deskthority.net/wiki/Cherry_M8
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Scan
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----
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The keyboard is comprised of some of 4000 series IC without microcontroller.
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RST>-----------+---------------+
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TC4520 | TC4520 |
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--------- carry ---------
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CLK>--->|row |------>|col |
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|counter|Q3 |counter|
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--------- ---------
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Q012 Q012
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||| |||
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||| ABC TC4028
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||| ---------
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||| |decoder|
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||| ---------
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||| |||||| col[0..7]
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ABC TC4512 vvvvvvv pull down
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---------- <----|+++++++|--100K--+
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|data | <----|+++++++|--100K--+
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STATE<--|selector| <----|+++++++|--100K--+
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| 7 to 1 | <----|+++++++|--100K--+
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---------- <----|+++++++|--100K--+
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row[0..7] | 8x8 matrix |
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| -
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TC4078 | GND
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------ |
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SENSE<----| OR |========+ OR'd row[0..7]
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------
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- TC4520BP - Dual Binary Up Counter
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- TC4028B - BCD-to-Decimal Decoder
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- TC4512BP - 8-Channel Data Selector
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- TC4081BP - Quad 2-Input AND Gate
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- TC4071BP - Quad 2-Input OR Gate
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- TC4078BP - 8-Input NOR/OR Gate
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Matrix
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------
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0 1 2 3 4 5 6 7
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--------------------------------------------------------------------
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0 ESC 1 2 3 4 5 6 7
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1 8 9 0 - ^ BS INS DEL
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2 TAB Q W E R T Y U
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3 I O P @ [ ] F2 F1
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4 CTRL A S D F G H J
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5 K L ; : RETURN UP F3 F4
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6 SHIFT Z X C V B N M
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7 SPACE , . / LEFT RIGHT DOWN HOME
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6P6C connector pinout
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---------------------
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1. VCC
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2. Clock - sends clock to binary counter TC4520
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3. Key State - indicates hi if key selected by counter is active
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4. Sense - indicates lo if any key is active while Reset is hi.
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5. Reset - resets counter and drives all column
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6. GND
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123456
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,--------.
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`--____--'
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plug
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Ping configuration
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------------------
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AVR ATmega32u4 is used as protocol converter.
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PD0: Clock. Counter couts up at falling edge.
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PD1: Key State. Hi if selected key is activated.
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PD2: Sense. Lo if any key is activated while Reset is Hi.
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PD3: Reset. Resets counters at riging edge.
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