NEC PD78214 - Manual (Page 176)

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Chapter 7 Timer/Counter Units
7
Fig. 7-49 TM1 Cleared after Capture Operation
TM1
Count clock
n-1 n 0 1
2
INTP0
TM1 is captured
to CR11 here
Cleared here
TM1 can also be cleared by software when the CE1 bit of the timer control register (TMC1) is reset to 0.
Similarly, clear operation is performed by the count clock pulse following the resetting of CE1 bit to 0. If the
CE1 bit is set to 1 before TM1 is reset to 0 by the resetting of the CE1 bit to 0 (that is, before the first count clock
pulse is applied after the CE1 bit is reset to 0), two operations are simultaneously performed: one operation
is an operation to clear TM1 to 0, and the other operation is a count operation starting with the counting of
0.
Fig. 7-50 Clear Operation When the CE1 Bit Is Reset to 0
(a) Basic operation
TM1
CE1
n-1 n 0
Count clock