I/O Ports and Registers
CNT24-4(PCI)
56
Interrupt mask (Command 15h)
D7
D6
D5
D4
D3
D2
D1
D0
15h
TIME
Not used
CH2
CH1
CH0
CH3
This shows the interrupt mask register status.
TIME and CH3 - CH0 monitor the current interrupt mask status that
has been output to the interrupt mask set port. TIME corresponds
to the programmable timer and CH3-CH0 corresponds to each
channel. If these bits are "1," the interrupt is masked and an
interrupt signal is not output.
To monitor the mask status, output 15h to the output port +0 and
read the input port +1.
0 : Masked
1 : Not masked
Note!
The default is 1Fh.
Sense port (Command 16h)
D7
D6
D5
D4
D3
D2
D1
D0
16h
TIME
Not used
CH2
CH1
CH0
CH3
This shows the channel count match and count-up. To monitor the
sense port, output 16h to output port +0 and read input port +1.
TIME :
This bit is set to "1" when the time set in the
program mable timer has elapsed.
CH3-CH0 :
For any channel between CH3-CH0, when a value
in the up/down counter and the comparison register
matches, the bit for the channel is set to "1." The
interrupt channel is determined by executing
counting on multiple channels and generating an
interrupt on the "matched" signal.
0 : Count did not match - Timer continues counting
1 : Count matches - Timer stops counting
Notes!
- The default is 00h.
- If an interrupt is enabled and generated and the TIME bit or one
of the CH3 to CH0 bits changes to "1" reset the corresponding
sense bit to enable the next interrupt. For details on sense bit
resetting, see "Sense Bit Reset" of the output port.
Содержание CNT24-4
Страница 1: ...CNT24 4 PCI 24Bit Up Down Counter Board for PCI User s Guide ...
Страница 13: ...Introduction CNT24 4 PCI 4 ...
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Страница 67: ...I O Ports and Registers CNT24 4 PCI 58 ...
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