Renesas M32R/ECU Series User Manual page 326

10
In the example below, the reload register is initially set to H'8000. When the timer starts, the reload register
value is loaded into the counter, letting it start counting down. In the diagram below, the value H'4000 is
written to the correction register when the counter has counted down to H'5000. As a result of this correction,
the count has been increased to H'9000, so that the counter counts a total of (H'8000 + 1 + H'4000 + 1)
before it stops.
correction register
Counter
Reload register
Correction register
TOP interrupt request
due to underflow
Note: • This diagram does not show detailed timing information.
Figure 10.3.10 Typical Operation in TOP Single-shot Output Mode When Count is Corrected
Enabled
(by writing to the enable bit
or by external input)
Count clock
Enable bit
Write to the
H'FFFF
Undefined
value
H'8000
H'0000
H'8000
Undefined
F/F output
Data inverted
by enable
MULTIJUNCTION TIMERS
10.3 TOP (Output-Related 16-Bit Timer)
Disabled
(by underflow)
H'5000+H'4000
H'(8000-1)
H'5000
H'4000
Data inverted
by underflow
10-83
H'FFFF
32180 Group User's Manual (Rev.1.0)