NEC PD789860 User Manual page 97

Figure 9-12. Timing of Interval Timer Operation with 8-Bit Resolution
Count clock
N − 1
TMn0 N
CRn0 N
TCEn0 H
INTTMn0
Note
TMO
Note Timer 40 only
Remark n = 3, 4
CHAPTER 9 8-BIT TIMERS 30 AND 40
(When CRn0 Changes from N to M (N > M))
M
00H
Clear
User's Manual U14826EJ5V0UD
N FFH
00H
Clear
M
TMn0 overflows
because M < N
CRn0 overwritten
M M 00H
00H
Clear
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