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Chapter 41 Up/Down Counter
5.Operation
5.7 Reload Timing
The next time when Up/Down Counter counts down below "0000", an underflow occurs (an interrupt request is
made) and then reloading is performed.
Compare value
Count value
Countdown
Underflow
Reload timing
Note: If clear and reload operations occur at the same time, clear takes precedence.
5.8 Writing a Value to Counter
RCR
Up/Down Counter
CSTR
CTUT
(1) Counting of Up/Down Counter is disabled.
(2) A value is written to PCR.
(3) "1" is written to the count write bit CTUT.
(4) A value is transferred from the reload/compare register RCR to Up/Down Counter.
854
0066
H
0001
0000
H
H
(2)
(2)
XXH
(1)
(1)
0066
0065
0064
H
H
67 H
H
67
67 H
(4)
(4)
(3)
(3)
H
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