NEC PD78214 - Manual (Page 243)

214
µ
PD78214 Sub-Series
Fig. 7-132 Count Start Operation
(5) Even when an instruction is executed to stop a timer (CEn ← 0), the value of TMn is not cleared to 0
immediately. Instead, the value of TMn is cleared to 0 by the count clock pulse occurring after an instruction
is executed (CEn
← 0) to stop the timer.
Even if a timer is started (CEn ← 1) before the timer is cleared to 0 immediately after the timer is stopped, the
timer counts up starting with 0.
Fig. 7-133 Count Operation Stop
Fig. 7-134 Timing of Count Operation Stop and Restart
Count clock
Actual counting starts
Count start instruction by software (CE
n
←1)
TMn (n = 0 to 3)
CE n
0 0 1 2 3
Count clock
TMn (n = 0 to 3) m m+1 0
Count stop
(CEn
←0)
Counter is cleared here
Count start (CE ←1)
Count clock
m m+1 0 1 TMn (n = 0 to 3)
Count stop (CEn ←0)
2