Measurement Computing PCM-DAC08 - Manual (Page 20)

DIO0 DIO1 DIO2 DIO3 DIO4 DIO5 DIO6 DIO7
0 1 2 3 4 5 6 7
BASE + 4 - Interrupt Control & Digital I/O Direction Control
WRITE: Set control bits.
READ: Read status of control bits.
LDIR UDIR INT_EN INTREQ X X X X
0 1 2 3 4 5 6 7
INTREQ
Default is no interrupt has occurred = 0. When set to 1 an interrupt has occurred.
External interrupts, when enabled, occur at TTL high (2.5<TTL High<5V).
A read base+1 clears this bit.
Interrupt status routinues may want to read and verify this bit then clear it with a read
of Base +1.
INT_EN
Enable external interrupt. Enable = 1. Disable = 0.
17