Renesas M32R/ECU Series User Manual page 330

10
In the example below, the counter and the reload register are initially set to H'A000 and H'F000, respectively.
When the timer is enabled, the counter starts counting down and when it underflows after reaching the
minimum count, the counter is loaded with the content of the reload register and continues counting down.
The counter stops when it underflows second time.
Count clock
Enable bit
H'FFFF
Counter
H'0000
Reload register
Correction register
F/F output
TOP interrupt request
due to underflow
Note: • This diagram does not show detailed timing information.
Figure 10.3.13 Typical Operation in TOP Delayed Single-shot Output Mode
Enabled
(by writing to the enable bit
or by external input)
H'F000
Count down from the
H'A000
counter's set value
H'F000
(Unused)
10-87
MULTIJUNCTION TIMERS
10.3 TOP (Output-Related 16-Bit Timer)
Underflow
(first time)
H'FFFF
H'(F000-1)
Count down from the
reload register's
set value
Data inverted
by underflow
Underflow
(second time)
Data inverted
by underflow
32180 Group User's Manual (Rev.1.0)