Ctr1 Out Signal; Ctr2 Clk Signal - Measurement Computing PCI-DAS6052 User Manual

PCI-DAS6052 User's Guide

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
0 and mode 2.
CTR1 CLK
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
shows the timing requirements for the CTR1 OUT signal for counter mode
Figure 4-30. CTR1 OUT Signal Timing
shows the timing requirements for the CTR2 CLK signal.
t =100 ns minimum
p
t t
w-H w-L
t =15 ns minimum
w-H
t =25 ns minimum
w-L
Figure 4-31. CTR2 CLK Signal Timing
TC
4-25
Functional Details