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

11.2

Configuration of Watch Timer

The watch timer is composed of the following four blocks.
• Interval selector
• Watch Counter
• Watch timer interruption generation circuit
• Watch timer control register (WTC)
Block Diagram of Watch Timer
Figure 11.2-1 shows the watch timer block diagram.
Watch timer control register (WTC)
WDCS SCE
Sub clock
Clock Counter
A 15-bit up-counter using the sub clock as the clock source.
Interval selector
A selector that selects one from seven types of interval of the watch timer interrupt.
Interrupt generation circuit
Generates an interval interrupt of the watch timer.
Watch timer control register (WTC)
It specifies the operation of the watch timer, the control of the watch timer interrupt, and the clock source
of the watchdog timer.
Figure 11.2-1 Block Diagram of Watch Timer
WTIE WTOF WTR WTC2 WTC1 WTC0
Clear
8
2
9
2
10
2
Watch Counter
11
2
12
2
13
2
14
2
10 13 14 15
2 2 2 2
Interrupt
Interval selector
generation
circuit
CHAPTER 11 WATCH TIMER
Watch timer
interrupt
to Watchdog timer
233