Renesas M32R/ECU Series User Manual page 324

10
In the example below, the reload register is initially set to H'A000. (The initial counter value can be undefined,
and does not have to be specific.) When the timer starts, the reload register value is loaded into the counter,
letting it start counting. Thereafter, it continues counting down until it underflows after reaching the minimum
count.
Counter
Reload register
Correction register
TOP interrupt request
due to underflow
Figure 10.3.8 Typical Operation in TOP Single-shot Output Mode
Enabled
(by writing to the enable bit
or by external input)
Count clock
Enable bit
H'FFFF
Indeterminate
value
H'A000
H'0000
H'A000
(Unused)
F/F output
Data inverted
by enable
Note: • This diagram does not show detailed timing information.
MULTIJUNCTION TIMERS
10.3 TOP (Output-Related 16-Bit Timer)
Disabled
(by underflow)
Starts counting down from
the reload register set value
H'(A000-1)
Data inverted
by underflow
10-81
H'FFFF
32180 Group User's Manual (Rev.1.0)