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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)： | 25/40頁 |
| 文件大?。?/td> | 468K |
| 代理商： | PCPIC |
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Interrupts
Most interrupt lines on the PCbus are already taken up by standard
peripherals - IRQ2, IRQ3, IRQ4, IRQ5 and IRQ7 can be driven by the
PCPIC
There are eight interrupt inputs on the PCPIC. They are wired to the
group 1 inputs; the counter outputs are also inverted then wired to
these inputs, so the counters can generate inputs as well. The
counter output buffers are open-collector, so if a counter output is
low, the buffer is disabled and the group 1 inputs can then trigger
interrupts if they go low. The interrupts are controlled by the bottom
two bits of the board control register at pointer 0CH. The register
description has details of what the bits do.
It is possible to use the interrupt facility to detect short active-low
pulses on group 1 without using PC interrupts. If the IRQ links are
not jumpered at all no interrupts will be passed on to the PC, but
you can still inspect and clear the RINT and CLINT registers.
Fault finding
As described earlier, there are several diagnostic aids on the PCPIC.
Firstly check that the red LED lights when (and only when) your
program is accessing the board. If it doesn't, it is likely that the
address your program is writing is not the one that the links are set
to. If this works, check that you can turn the green LED on and off
by writing to its register. Try reading the board identification. If this
is not correct but the LEDs have been working correctly it is possible
that there is another board at the same address.
J230 PCPIC
Page 25
2192-09155-000-000
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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: 抗拉強度: 外部導(dǎo)管寬度:25 mm 外部導(dǎo)管高度:25 mm |
| PCPL-17B | 制造商:PMA 功能描述:20MM POLY. BLK CONT. PACK |
| 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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