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CHAPTER 8 16-BIT RELOAD TIMER
8.4
Operation of 16-bit Reload Timer
This section describes the reload timer operation.
■ Internal Clock Operation
If the timer operates with a divide-by clock of the internal clock, one of the clocks generated by dividing
the machine clock by 2, 8, 32, 64, or 128 can be selected as the clock source.
To start the count operation as soon as counting is enabled, write "1" to both CNTE and TRG bits of the
control status register. Trigger input occurring due to the TRG bit is always valid regardless of the
operating mode while the timer is running (CNTE=1).
Figure 8.4-1 shows the startup and operations of the counter.
After the counter start trigger is input, Time T (T: peripheral clock machine cycle) is required for loading
data of the reload register into the counter.
Count clock
Counter
Data load
CNTE (register)
TRG (register)
158
Figure 8.4-1 Startup and Operations of the Counter
Reload data
T
-1
-1
-1
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