WinSystems PCM-AIO, Operation Manual, Page: 19 / 43

2.16
D/A Software Flowchart/Assembly Routine
8088/8086 AS SEM BLY LAN GUAGE ROU TINE
8088/8086 AS SEM BLY LAN GUAGE ROUTINE
MOV DX,PORT_AD DRESS
MOV AL,LOW_BYTE
OUT DX,AL
INC DX
MOV AL,HIGH_NIB BLE
OUT DX,AL
NOTE: The LOW_BYTE and HIGH_NIB BLE form the 12 bit data that is writ ten to the D/A. The
PORT_AD DRESS is the I/O ad dress that is de coded on the se lected PCM- AIO.
980723 OPERATIONS MANUAL PCM-AIO Page 2-11
WinSystems - "The Embedded Systems Authority"
3 o
2 o
1 o
8 o o 7
6 o o 5
4 o o 3
2 o o 1
3 2 1
o o o
J4
J6
J5
D/A Output Configuration
Jumpers J4, J5, J6
OUTPUT ROUTINE (ONE CHANNEL)
LOAD ACC = LOW BYTE VALUE
OUTPUT ACC TO I/O BASE + 08
LOAD ACC = HIGH BYTE VALUE
OUTPUT ACC TO I/O BASE+09, DAC CHAN 0 UPDATED
NEXT CHANNEL