Contec DAI12-4FITGY, Руководство пользователя, Страница: 35 / 65

Using the I/O Address Map
30
DAI12-4(FIT)GY
Setting an Interrupt Source
This option allows you to specify an interrupt signal generation source.
The control port that sets an interrupt source assumes the following state:
Figure 4.15. Interrupt Source Output Port
When the value [1] is output as an interrupt source, the control port is masked; when
the value [0] is output, the port is set as an interrupt source.
[1] Masked * Initialized state
[0] Interrupt Request Enable
Following are examples in which a timer cycle is set in high-level languages:
Microsoft C Microsoft QBASIC
outp( ADR+24, 0x1 ); OUT ADR+24, &H1
outp( ADR+28, InterruptFactor ); OUT ADR+28, InterruptFactor
D7
D7 D6 D5 D4 D3 D2 D1 D0
D6 D5 D4 D3 D2 D1 D0
Command
0 0 0 0 0 0 0 1
output
+24
(18h)
output
+28
(1Ch)
Interrupt Source
1 1
1 1 1
Pacer
Clock Error
End of
Conversion
Pacer
Clock Input
Starting
I/O Address