NEC PD78F9488 - Manual (Page 164)

CHAPTER 8 WATCH TIMER
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User’s Manual U15331EJ4V1UD
(2) Watch timer interrupt time selection register (WTIM)
This register is used to set the interrupt time by selecting either the source clock or the clock divided by 2 for
the subsystem clock to be input to watch timer.
WTIM is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets this register to 00H.
Figure 8-3. Format of Watch Timer Interrupt Time Selection Register
Symbol 7 6 5 4 3 2 1 <0> Address After reset R/W
WTIM 0 0 0 0 0 0 0 WTS FF4BH 00H R/W
WTS Selection of watch timer interrupt time Note
0 0.5 s (f
XT
)
1 1.0 s (f
XT
/2)
Note The selection is only available when bit 7 (WTM7) of the watch timer mode control register (WTM) is 1.
Remark f
XT
: Subsystem clock oscillation frequency