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10
In the example below, the reload register has the initial value H'A000 set in it. (The initial value of
the counter can be indeterminate, and does not have to be specific.) When the timer starts, the
reload register value is loaded into the counter causing it to start counting. Thereafter, it continues
counting down clock pulses until it underflows after reaching the minimum count.
Count clock
Enable bit
H'FFFF
Counter
Reload register
Correction register
F/F output
TOP interrupt
due to underflow
Note: This diagram does not show detail timing information.
Figure 10.3.10 Typical Operation in TOP Single-shot Output Mode
Enabled (by writing to enable bit
or by external input)
Starts counting down
from the reload register set value
H'A000
H'0000
H'A000
(Not used)
Data inverted
by enable
10.3 TOP (Output-related 16-bit Timer)
Disabled (by underflow)
10-85
MULTIJUNCTION TIMERS
H'FFFF
Data inverted
by underflow
Ver.0.10
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