6522.yaml

---
description: "Versatile Interface Adapter"
aliases:     [W65C22]
package:     DIP
pincount:    40
family:      "MOS Technology"
datasheet:   "http://www.westerndesigncenter.com/wdc/documentation/w65c22.pdf"
pins:
  - num:  1
    sym:  GND
    desc: ground
  - num:  2
    sym:  PA0
    desc: port A
  - num:  3
    sym:  PA1
    desc: port A
  - num:  4
    sym:  PA2
    desc: port A
  - num:  5
    sym:  PA3
    desc: port A
  - num:  6
    sym:  PA4
    desc: port A
  - num:  7
    sym:  PA5
    desc: port A
  - num:  8
    sym:  PA6
    desc: port A
  - num:  9
    sym:  PA7
    desc: port A
  - num:  10
    sym:  PB0
    desc: port B
  - num:  11
    sym:  PB1
    desc: port B
  - num:  12
    sym:  PB2
    desc: port B
  - num:  13
    sym:  PB3
    desc: port B
  - num:  14
    sym:  PB4
    desc: port B
  - num:  15
    sym:  PB5
    desc: port B
  - num:  16
    sym:  PB6
    desc: port B (pulse counting input for timer 2)
  - num:  17
    sym:  PB7
    desc: port B (controllable by timer 1)
  - num:  18
    sym:  CB1
    desc: port B control (shift register clock)
  - num:  19
    sym:  CB2
    desc: port B control (shift register data)
  - num:  20
    sym:  Vcc
    desc: supply voltage
  - num:  21
    sym:  ~IRQ
    desc: interrupt request output*
  - num:  22
    sym:  R/~W
    desc: read/write select
  - num:  23
    sym:  ~CS2
    desc: chip select (active low)
  - num:  24
    sym:  CS1
    desc: chip select (active high)
  - num:  25
    sym:  "∅2"
    desc: phase-2 clock input
  - num:  26
    sym:  D7
    desc: data bus
  - num:  27
    sym:  D6
    desc: data bus
  - num:  28
    sym:  D5
    desc: data bus
  - num:  29
    sym:  D4
    desc: data bus
  - num:  30
    sym:  D3
    desc: data bus
  - num:  31
    sym:  D2
    desc: data bus
  - num:  32
    sym:  D1
    desc: data bus
  - num:  33
    sym:  D0
    desc: data bus
  - num:  34
    sym:  ~RES
    desc: reset (active low)
  - num:  35
    sym:  RS3
    desc: register select (address bus)
  - num:  36
    sym:  RS2
    desc: register select (address bus)
  - num:  37
    sym:  RS1
    desc: register select (address bus)
  - num:  38
    sym:  RS0
    desc: register select (address bus)
  - num:  39
    sym:  CA2
    desc: port A control
  - num:  40
    sym:  CA1
    desc: port A control
specs:
  - param: "Maximum clock frequency"
    val:   [1 (NMOS), 14 (W65C22)]
    unit:  MHz
notes:
  - "* In older chips, ~IRQ was an open drain output. In the W65C22S, it is fully driven."
  - "Registers:
<table>
<tr><td>$00</td><td>Output register B (write), input register B (read)</td></tr>
<tr><td>$01</td><td>Output register A (write), input register A (read)</td></tr>
<tr><td>$02</td><td>Data direction register B</td></tr>
<tr><td>$03</td><td>Data direction register A</td></tr>
<tr><td>$04</td><td>Timer 1 latch LSB (write), timer 1 counter LSB (read)</td></tr>
<tr><td>$05</td><td>Timer 1 counter MSB</td></tr>
<tr><td>$06</td><td>Timer 1 latch LSB</td></tr>
<tr><td>$07</td><td>Timer 1 latch MSB</td></tr>
<tr><td>$08</td><td>Timer 2 latch LSB (write), timer 2 counter LSB (read)</td></tr>
<tr><td>$09</td><td>Timer 2 counter MSB</td></tr>
<tr><td>$0A</td><td>Shift register</td></tr>
<tr><td>$0B</td><td>Auxiliary control register</td></tr>
<tr><td>$0C</td><td>Peripheral control register</td></tr>
<tr><td>$0D</td><td>Interrupt flag register</td></tr>
<tr><td>$0E</td><td>Interrupt enable register</td></tr>
<tr><td>$0F</td><td>Same as register $01, but with no effect on handshake</td></tr>
</table>"
  - Timer 1 can operate in one-shot mode or free-running mode (square wave).
  - Timer 2 can operate in one-shot mode or pulse-counting mode (counts negative pulses on PB6).
  - "Counters for timers in one-shot or free-running mode decrement at the &empty;2 clock rate."
  - The shift register is 8 bits wide, can shift in or out, and can generate its own clock or shift under the control of an external clock on CB1.
...