NEC PD78214 - Manual (Page 197)

168
µ
PD78214 Sub-Series
(c) When the value of TM2 is FFH
(2) Clear operation
After a coincidence with the CR21 compare register or capture operation, 8-bit timer 2 (TM2) can be
automatically cleared. If a TM2 clear cause occurs, TM2 is cleared to 00H by the next count clock pulse. This
means that even if a TM2 clear cause occurs, TM2 holds the value existing at that time until the next count
clock pulse is applied.
Fig. 7-72 TM2 Cleared by a Coincidence with Compare Register (CR21)
Count clock
f
CLK
/8
TM2
Cleared by software
OVF2
OVF2 ←0
FEH FFH 0H 1H
Count clock
Compare register
(CR21)
TM2 n-1 n 0 1
Coincidence between
TM2 and CR21
Cleared here
n
Fig. 7-73 TM2 Cleared after Capture Operation
TM2
Count clock
n-1 n 0 1
2
INTP1
TM2 is captured
to CR22 here
Cleared here