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❍ Operation in one-shot mode
If the counter value causes an underflow ("0000
this case, the timer interrupt request flag (UF) is set to "1". If the interrupt request enable bit
(INTE) is set to "1", an interrupt request occurs. The TOT pin outputs a square wave that
indicates counting in progress. Figure 14.4-11 shows the count operation in one-shot mode.
Figure 14.4-11 Count operation in one-shot mode (event count mode)
TIN pin
Counter
Data load signal
UF bit
CNTE bit
TRG bit
TOT pin
T : Machine cycle
* : It takes 1T from trigger input to loading reload data.
Note:
Both the "H" width and "L" width of clock input to the TIN pin shall be 4T (T: machine cycle) or
more.
Reload
-1
0000
FFFF
H
data
T*
Waiting for start trigger input
CHAPTER 14 16-BIT RELOAD TIMER
" → "FFFF
"), the counter stops at "FFFF
H
H
Reload
-1
0000
H
data
FFFF
H
H
". In
H
311
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