NEC PD78F9488 - Manual (Page 114)

CHAPTER 6 16-BIT TIMER 20
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User’s Manual U15331EJ4V1UD
Figure 6-5. Timing of Timer Interrupt Operation
CR20
INTTM20
TO20
TOF20
N N N N N
t
0000H N FFFFH N 0000H 0001H 0001H
Count clock
TM20 count value
Interrupt
acknowledgement
Interrupt
acknowledgement
Overflow flag set
Remark N = 0000H to FFFFH