PCI-DAS6052 User's Guide
Functional Details
CTR1 OUT signal
This signal is present on the CTR1 OUT pin. The CTR1 OUT signal is the output of one
of the two user’s counters in an industry-standard 82C54 chip.
For detailed information on counter operations, please refer to the data sheet on our
WEB page at
http://www.measurementcomputing.com/PDFmanuals/82C54.pdf
.
Figure 4-30
Figure 4-30. CTR1 OUT Signal Timing
shows the timing requirements for the CTR1 OUT signal for counter mode
0 and mode 2.
CTR1 CLK
TC
CTR1 OUT (Mode 2)
CTR1 OUT (Mode 0)
CTR2 CLK signal
The CTR2 CLK signal can serve as the clock source for independent user counter 2. It
can be selected through software at the CTR2 CLK pin rather than using the on-board
10 MHz or 100 kHz sources. It is also polarity programmable. The maximum input
frequency is 10 MHz. There is no minimum frequency specified.
Figure 4-31
Figure 4-31. CTR2 CLK Signal Timing
shows the timing requirements for the CTR2 CLK signal.
t
w-L
t
w-H
=15 ns minimum
t
w-H
t
p
=100 ns minimum
t
w-L
=25 ns minimum
4-25
