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Chapter 5
(65535-50000)/1K = 15.535 sec.
The following C program is the example to explain how to implement
the pulse width measurement by software.
outport(addr2_1712+0x26,0x00);
while(!kbhit())
{
outport(addr2_1712+0x1e,0x70);
outport(addr2_1712+0x1a,0xff);
outport(addr2_1712+0x1a,0xff);
outport(addr2_1712+0x1e,0xb0);
outport(addr2_1712+0x1c,0xff);
outport(addr2_1712+0x1c,0xff);
outport(addr2_1712+0x24,0x80);
outport(addr2_1712+0x24,0x88);
outport(addr2_1712+0x24,0x31);
PCI-1712/1712L User's Manual
Figure 5-7: Pulse width measurement
– 52 –
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//Set internal clock as 10 MHz
//CNT1 82C54 mode 0
//Set CNT1 low byte
//Set CNT1 high byte
//CNT2 82C54 mode 0
//Set CNT2 low byte
//Set CNT2 high byte
//Set CNT2's gate input as high
//Generate one clock to CNT2
/*Set CNT2's clock source as
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