Overview Of Watch Counter - Fujitsu F2MC-8FX Hardware Manual

CHAPTER 14 WATCH COUNTER
14.1

Overview of Watch Counter

The watch counter can generate interrupt requests ranging from min. 125ms to max.
63s intervals.
Watch Counter
The watch counter performs counting for the number of times specified in the register by using the selected
count clock and generates an interrupt request. The count clock can be selected from the four types shown
in Table 14.1-1. The count value can be set to any number from 0 to 63. When "0" is selected, no interrupt
is generated.
When the count clock is set to 1s and the count value is set to "60", an interrupt is generated every one
minute.
Table 14.1-1 Count Clock Types
F : Subclock
CL
206
Count clock
12
2 /F
CL
13
2 /F
CL
14
2 /F
CL
15
2 /F
CL
Count cycle when F operates at 32.768kHz
CL
125ms
250ms
500ms
1s