The timer can be configured for continuous periodic operation as per the
settings shown in Table 2-1.
Table 2-1. Timer Configuration
Timer Setting
Value
START
None (ON = 1)
RESET
At PR Match
STOP
None
CSYNC (Clock Sync)
Sync
PR (Period Register)
Desired Period Value - 1 (e.g., for a desired period
of 20, PR = 19)
The counter counts until a PR match occurs, and then rolls over to zero and
continues counting. At PR match, the PRIF interrupt and output pulse occur. At the
following clock, the counter returns to zero and the ZIF interrupt occurs. This is shown
in Figure 2-1.
If RESET = None, the counter will rollover at the maximum value of the timer
(0xF...FF) with ZIF, but the output pulse and PRIF will occur at PR match. This is shown
in Figure 2-2.
The software can capture (read) the counter value using CAPT command at any
time.Figure 2-1. Periodic Rollover With
ResetFigure 2-2. Periodic Rollover Without
Reset
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