Overview Of Watch Timer - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 11 WATCH TIMER
11.1

Overview of Watch Timer

The watch timer is a 15-bit timer using the sub clock. It can generate interval interrupts.
The watch timer can also be used as the clock source of the watchdog timer by setting
so.
Functions of Watch Timer
The watch timer consists of a 15-bit timer and a circuit that controls interval interrupt.
The watch timer uses the sub clock, regardless of the values of the PLL clock selection bit (MCS) and sub
clock selection bit (SCS) of the clock selection register (CKSCR).
The interval time of the watch timer are shown in Table 11.1-1.
Table 11.1-1 Interval Times of Watch Timer
WTC2
0
0
0
0
1
1
1
1
*: Four dividing of sub clock 32 kHz (=8 kHz)
232
WTC1 WTC0
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
Interval Time*
31.25 ms
62.5 ms
125 ms
250 ms
500 ms
1.000 s
2.000 s
Setting disabled