Renesas M32R/ECU Series User Manual page 335

10
In the example below, the counter and the reload register are initially set to H'A000 and H'E000, 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.
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 10.3.18 Typical Operation in TOP Continuous Output Mode
Enabled
(by writing to the enable bit
or by external input)
H'E000
Count down from the
H'A000
counter's set value
H'E000
(Unused)
Data inverted by
enable
10-92
MULTIJUNCTION TIMERS
10.3 TOP (Output-Related 16-Bit Timer)
Underflow Underflow
(first time) (second time)
H'FFFF
H'(E000-1)
Count down from the
reload register's
set value
Data inverted Data inverted
by underflow by underflow
32180 Group User's Manual (Rev.1.0)
H'FFFF
H'(E000-1)
Count down from the
reload register's
set value