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參數(shù)資料
| 型號： | PCPIC |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁數(shù)： | 15/40頁 |
| 文件大小： | 468K |
| 代理商： | PCPIC |
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2192-09155-000-000
The register bits are arranged as follows:
The counter control bits perform the following functions:
The interrupt select bits perform the following functions:
The interrupt inputs are connected directly to group 1 pins on the
D50 connector and via inverting open-collector buffers to the
counter outputs . This means that if you are programming the
counters to produce interrupts you must remember that the counter
outputs are inverted before being presented to the interrupt
controller.
The other point to note is that a high counter output will prevent the
corresponding group 1 input from being used as an interrupt input.
If you wish to use a group 1 line as an input you must ensure that its
corresponding counter output is low. One simple way to do this is
to set the counter up in mode 0 and only write one of the two
counter bytes.
J230 PCPIC
Page 15
Bit
7
6
5
4
3
2
1
0
C2U
C1U
C0U
C2L
C1L
C0L
IS1
IS0
Counter control bit 2 for the upper four counters
Counter control bit 1 for the upper four counters
Counter control bit 0 for the upper four counters
Counter control bit 2 for the lower four counters
Counter control bit 1 for the lower four counters
Counter control bit 0 for the lower four counters
Interrupt select bit 1
Interrupt select bit 0
Name
Comments
Bit
210
111
110
Timers with start inputs on group 2 and stop inputs on group 3
Counters with start inputs on group 2 and stop inputs on group 3
Count inputs are on group 0
Timers with enable inputs on group 2
Counters with enable inputs on group 2
Count inputs are on group 0
Free-running timers
Frequency inputs on group 0
Reset the start-stop flip-flops
Free-running counters, inputs on group 0
101
100
011
010
001
000
Comments
Bit
IS1
1
1
0
0
IS0
1
0
1
0
Interrupt on timer 0
Interrupt if one or more input is high
Interrupt if one or more input is low
Interrupt if all inputs are low
Comments
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