NEC PD78F9488 - Manual (Page 137)

CHAPTER 7 8-BIT TIMERS 50, 60, AND 61
User’s Manual U15331EJ4V1UD
137
Figure 7-13. Timing of Interval Timer Operation with 8-Bit Resolution (When CRnm Is Set to FFH)
Count clock
CRnm
TCEnm
INTTMnm
TOnm
FFH
TMnm FFH 00H 01H 00H 01H 00H FFH 00H 01H FFH FFH 00H
Clear Clear Clear
Count start
Remark nm = 50, 60, 61
Figure 7-14. Timing of Interval Timer Operation with 8-Bit Resolution
(When CRnm Changes from N to M (N < M))
Count clock
CRnm
TCEnm
INTTMnm
TOnm
TMnm N 00H 00H N 00H 01H 00H 01H M N M
N M
Clear Clear Clear
Count start
Interrupt acknowledgement Interrupt acknowledgement
CRnm overwritten
Remark 00H ≤ N < M ≤ FFH
nm = 50, 60, 61