MB90480/485 Series
13. Watch Timer
The watch timer is a 15-bit timer using the sub clock. This circuit can generate interrupts at predetermined
intervals. Also a setting is available to enable it to be used as the clock source for the watchdog timer.
(1) Register List
Watch timer control register (WTC)
7
6
5
4
3
2
1
0
0000AAH
WDCS
SCE
WTIE
WTOF
WTR
WTC2 WTC1
WTC0
Read/write
Initial value
R/W
1
R
0
R/W
0
R/W
0
R/W
1
R/W
0
R/W
0
R/W
0
(2) Block Diagram
Watch timer control register (WTC)
WDCS
SCE
WTIE
WTOF
WTR
WTC2
WTC1
WTC0
Clear
28
29
Interrupt
generator
circuit
Sub clock
Interval
selector
210
211
212
213
214
Watch timer
interrupt
Watch counter
210 213 214 215
To watchdog timer
65
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