Parameterising 2/4xcounter module
2 × 32 bit counter with GATE, RES level-triggered and auto reload (mode 14 and 15)
12
Parameter setting
12.4
12.4.8
l
12.4-19
EDSPM-TXXX-3.0-04/2004
12.4.8 2 × 32 bit counter with GATE, RES level-triggered and auto reload (mode 14
and 15)
epm-t082
Fig. 12.4-26 Terminal assignment of the 2/4xcounter in the modes 14 and 15
In the modes 14 and 15, two 32-bit counters are available, which are controlled via
a gate signal (gate). A starting value and a comparison value can be assigned to
each counter.
These modes offer thefunction ”Auto Reload”. This means, that the Load Register
can be assigned with a value which is automatically loaded into the counter as
soon as it reaches the comparison value set.
The modules differ in having different counting directions:
Mode 14: Upcounter.
Mode 15: Downcounter
A HIGH level at input IN1 / IN4 (RES) sets the counter to zero.
If a HIGH level is applied to input IN3 / IN6 (GATE), the counter is incremented or
decremented by 1 with each LOW/HIGH edge.
The counter counts up to the value set in the compare register. With this last
LOW-HIGH edge the counter content is overwritten with the value set in the load
register. This is repeated until the input IN3 / IN6 (GATE) receives a LOW signal.
If an ”Auto Reload” occurs, the signal level at the output OUT0 / OUT1 changes.
(A LOW-HIGH edge at the input IN1 / IN4 (RES) does not reset the output
OUT0 / OUT1.)
Terminal assignment
RES signal
GATE/CLK signal
OUT signal
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