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參數(shù)資料
| 型號： | PIO-96 |
| 英文描述： | 96 CHANNEL PROGRAMMABLE INPUT/ |
| 中文描述： | 96通道可編程的輸入/ |
| 文件頁數(shù)： | 16/29頁 |
| 文件大?。?/td> | 108K |
| 代理商： | PIO-96 |
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Example Programs
Page 17
Blue Chip Technology Ltd.
01271015.doc
Page 17
Example Program 2
This example program shows the use of interrupts generated from the
PD71055 PIO chip. The program sets mode 1 operation which allows data to
be strobed into Port 0 of the first
PD71055 via a LOW signal on Port 2 bit 4.
To determine when data has been strobed into the data port, this example polls
the
PD71055 port 2 register which in mode 1 acts as a control/status register.
In normal use an interrupt handler routine written in C or assembler would be
resident in memory to respond to the hardware interrupt generated by the PIO
card.
NOTES:
Prior to using interrupts, an interrupt routine must be installed in memory by
the application software.
To use interrupts ALL unused “INT0” and “INT1” lines (bits 0 and 3 of
each
PD71055 port 2) must be LOW. This means that if a PD71055 has
been set to (say) mode 0 with all ports as output then Port 2 output lines 0
and 3 must be written to a zero (LOW) state.
If the ports were set to inputs then interrupts will only occur if Port 2 input
lines 0 and 3 are LOW for each
PD71055 not being used in an interrupt
mode.
The above is necessary because each PD71055 “INT0” and “INT1” lines
are logically OR-ed together.
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