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10
(2) Precautions to be observed when using TOP continuous output mode
The following describes precautions to be observed when using TOP continuous output mode.
• If the timer is enabled by external input in the same clock period as count is disabled by writing
to the enable bit, the latter has priority (so that count is disabled).
• When you read the counter immediately after reloading it pursuant to underflow, the value you
get is temporarily H'FFFF. But this counter value immediately changes to (reload value - 1) at
the next clock edge.
• Because the internal circuit operation is synchronized to the count clock (prescaler output), a
finite time equal to a prescaler delay is included before F/F starts operating after the timer is
enabled.
Internal clock
Count clock
Enable
F/F operation
Figure 10.3.22 Prescaler Delay
Write to enable bit
Prescaler cycle
Delay
till prescaler cycle
10-99
MULTIJUNCTION TIMERS
10.3 TOP (Output-related 16-bit Timer)
Ver.0.10
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