NEC PD78F9488 - Manual (Page 155)

CHAPTER 7 8-BIT TIMERS 50, 60, AND 61
User’s Manual U15331EJ4V1UD
155
Figure 7-26. Operation Timing When Overwriting CR50 (When Rising Edge Is Selected)
(1) When setting CR50 > TM50 after overflow
Count clock
CR50
TCE50
INTTM50
TO50
N
TM50 N 00H 00H 00H 01H FFH M FFH 01H
M
Overflow Overflow Overflow
Count start
CR50 overwrite
(2) When setting CR50
< TM50 after overflow
Count clock
CR50
TCE50
INTTM50
TO50
N
TM50 N 00H 00H 00H 01H FFH FFH 01H
01H
02H 01H
Overflow Overflow Overflow
Count start
CR50 overwrite Overflow occurs but
no change takes place
because TO50 is
high level.
Remark N, M = 00H to FFH