Programming instructions

Chapter 27 Counting Signal Highs and Lows
LabVIEW Data Acquisition Basics Manual 27-2
© National Instruments Corporation
Am9513
With the Am9513, you can extend the counting range of a counter by
connecting the OUT of one counter to the SOURCE of the next higher
order counter (counter+1). This is called
cascading
counters. By cascading
counters you can increase your counting range from a 16-bit counting range
of 65,535 to a 32-bit counting range of 4,294,967,295. The Am9513 chip
has a set of 5 counters where higher order counters can be cascaded. The
TIO-10 device has two Am9513 chips for a total of 10 counters. Table 27-1
identifies adjacent counters on the Am9513 (one and two chips). This
information is useful when cascading counters.
Figure 27-3 shows typical external connections for cascading counters
when counting events. Notice that the OUT of
counter
is connected to the
SOURCE of
counter+1
.
Figure 27-3.
External Connections to Cascade Counters for Counting Events
Table 27-1.
Adjacent Counters for Counter Chips
Next Lower Counter Counter Next Higher Counter
5 1 2
1 2 3
2 3 4
3 4 5
4 5 1
10 6 7
6 7 8
7 8 9
8 9 10
9 10 6