User`s manual

PK2100
D-4 s Appendix D: I/O Map and Interrupt Vectors
Table D-2 and Table D-3 present the I/O addresses that control I/O
devices external to the Z180 processor.
Table D-2. Write Registers
Address Bit(s) Symbol Function
0x80 0 SDA_W EEPROM data, write.
0x81 0 KEYR2
Keypad drive row 2. Open collector,
“1” drives low.
0x82 0 ENB485 Enable RS-485 channel.
0x83 0 BEEPH
Beeper, high-voltage drive. “1”
drives beeper.
0x84 0 SCL EEPROM clock bit.
0x85 0 KEYR3
Keypad drive row 3. Open collector,
“1” drives low.
0x86 0 KEYR1
Keypad drive row 1. Open collector,
“1” drives low.
KEYR4
Keypad drive row 4. Open collector,
“1” drives low.
0x87 0
DRV10
Also, tenth digital output if key row
not used.
0x88 0-7 UEXP
Internal DAC for successive approxi-
mation. The high 8 bits of the digital
value route through the PK2100’s 8-
bit DAC. The low 2 bits of the
digital value route through an analog
circuit and are controlled via
UEXPA and UEXPB (below).
0x90 0-7 DAC
External DAC for voltage or current
output. The high 8 bits of the digital
value route through the PK2100’s 8-
bit DAC. The low 2 bits of the
digital value route through an analog
circuit and are controlled via DACA
and DACB (below).
0x98 0 BEEPL
Beeper, low-voltage drive. “1”
drives the beeper.
0x99 0 DRV1 Digital output 1. “1” drives output.
0x9A 0 DRV2 Digital output 2. “1” drives output.
0x9B 0 DRV3 Digital output 3. “1” drives output.
0x9C 0 DRV4 Digital output 4. “1” drives output.
continued…