UPD784938 Datasheet, PDF (282/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 10 TIMER/EVENT COUNTER 1
Figure 10-6. Basic Operation in 16-Bit Operation Mode (BW1 = 1)
(a) Count started → count disabled → count started
Count clock
TM1W 0H 0H 1H 2H
FFH 100H 101H
0H
0H 1H
CE1
Count started
CE1 ← 1
Count stopped
CE1 ← 0
(b) When “1” is written to the CE1 bit again after the count starts
Count clock
Count started
CE1 ← 1
TM1W 0H 0H 1H 2H 3H 4H 5H 6H
CE1
Count started
CE1 ← 1
(c) Operation when TM1W = FFFFH
Count clock
Rewrite
CE1 ← 1
TM1W FFFEH FFFFH 0H 1H
OVF1
Cleared by software
OVF1 ← 0
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Preliminary User’s Manual U13987EJ1V0UM00