UPD780828A Datasheet, PDF (166/472 Pages) NEC – 8-bit Single-Chip Microcontroller

Chapter 9 Watch Timer
Figure 9-2: Watch Timer Mode Control Register (WTM) Format (2/2)
WTM1
0 Clear after operation stop
1 Operation enable
5-Bit Counter Operation Control
WTM0
0 Clear after operation stop
1 Operation enable
Prescaler Operation Control
Caution: When the watch timer is used, the prescaler should not be cleared frequently. When
rewriting WTM4 to WTM6 to other data, stop the timer operation beforehand.
Remarks: 1. f_W: Watch timer clock frequency (f_X/2⁷ or f_X/2¹¹)
2. f_X: Main system clock oscillation frequency
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User’s Manual U16504EE1V1UD00