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16-bit Interval Timer Z (TMZ)
Chapter 12
Preliminary User’s Manual U17566EE1V2UM00
12.3 Timing
The contents of the reload register TZnR can be changed at any time, provided
the timer is enabled. The contents is then copied to the reload buffer. However,
the counter reloads its start value from the buffer only upon underflow.
Caution
When specifying PCLK4, PLCK5, PCLK7 or PCLK9 as the count clock, a jitter
of maximum ± 1 period of PCLK2 may be applied to the TZnCNT counter’s
count clock input.
12.3.1
Steady operation
Steady operation is illustrated in the following figure.
Figure 12-2
Reload timing and interrupt generation
D0 and D1 are two different reload values.
Note that there is a delay between writing to TZnR and making the data
available in the reload buffer, depending on the previous reload value and the
chosen count clock.
D0
D0
D1
D1
D
0
D
0
D
0
D1
D
0
D1
D
0
0000
H
16
-
bit down
counter value
Reload buffer
TZnR
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