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參數(shù)資料
| 型號(hào)： | 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)： | 20/40頁 |
| 文件大?。?/td> | 468K |
| 代理商： | PCPIC |
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2192-09155-000-000
given connection details in terms of the ribbon-cable pins that will
be connected when an IDC 50-way D connector is plugged in. They
are referred to as RCx where x is a number between 1 and 50. For
ease of reference the corresponding D connector pins are also shown
on the circuit diagram and in Appendix B.
Digital I/O
The PCPIC can be used for simple digital I/O. You can read the state
of the inputs on groups 1 and 2 of the D50 connector by writing 10H
to the pointer register at 180H and reading the value at 181H (for
group 1), or writing 11H to 180H and reading 181H for group 2.
The group 1 inputs are also connected to the counter outputs,
however, and you must ensure that the counter output is low,
otherwise it may force the input to be low (remember that the
counter output buffer is inverting).
One way to do this is to set the counter into mode 0 and only write
one of the counter bytes. For counter 0, for example, write 03 to 180H
to set up the pointer, then write 70H to put IC23's counter 1 (the
PCPIC's counter 0, since IC23's counter 0 is used for the timebase)
into mode 0. Write 01H to 180H to make the pointer point to IC23's
counter 1, then write (say) 0 to 181H.
Frequency Outputs
The PCPIC can produce up to eight square-wave outputs by feeding
the timebase into the counters and setting them to mode 3, as
follows:
Make LK1B to feed 25kHz into the timebase.
Set the timebase counter to 25, to create a 1ms clock:
Write 36H to pointer 3
Write 19H to pointer 0
Write 00H to pointer 0
Set the PCPIC up for free-running timers, clock via timebase:
Write 6CH to pointer 12H
Set a counter up (for example counter 0) as a square-wave output
counter in mode 3, dividing by (say ) 100 to give a 10 Hz output:
Write 76H to pointer 3
Write 64H to pointer 1
Write 00H to pointer 1
Measuring Frequency
The frequency to be measured is fed into a group 0 input and the
counter gate is opened for a fixed length of time; the amount by
which the counter has counted down is then the number of counts
in a given time, which is frequency. The gate open time is defined by
J230 PCPIC
Page 20
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| PCPKITIW | 功能描述:電線導(dǎo)管 Pan Pole Replacement Parts Kit (includes RoHS:否 制造商:Panduit 類型:Slotted SideWall Open finger design wiring cut 材料:Polypropylene 顏色:Light Gray 大小: 最大光束直徑: 抗拉強(qiáng)度: 外部導(dǎo)管寬度:25 mm 外部導(dǎo)管高度:25 mm |
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| PCPLHK | 功能描述:ANT SUB YAGI 10-13 ELEMENT KIT RoHS:是 類別:RF/IF 和 RFID >> RF 天線 系列:* 標(biāo)準(zhǔn)包裝:1 系列:* |
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