Fujitsu F2MC-8FX Hardware Manual page 211

Table 13.3-1 Functional Description of Each Bit of Watch Prescaler Control Register (WPCR)
Bit name
WTIF:
bit7 Watch interrupt request
flag bit
WTIE:
bit6 Interrupt request
enable bit
bit5
to Unused bits
bit3
WTC1, WTC0:
bit2
Watch interrupt
bit1
interval time select bits
WCLR:
bit0 Watch timer
initialization bit
This bit becomes "1" when the selected interval time of the watch prescaler has elapsed.
• Interrupt requests are generated when this bit and the interrupt request enable bit (WTIE) are set to
"1".
Writing "0" : sets this bit to "0".
Writing "1" : ignored and has no effect on the operation.
• "1" is always read in read-modify-write operation.
This bit enables or disables the output of interrupt requests to interrupt controller.
Writing "0" : disables the interrupt request output of the watch prescaler.
Writing "1" : enables the interrupt request output of the watch prescaler.
• Interrupt requests are outputted when this bit and the watch interrupt request flag bit (WTIF) are
set to "1".
These bits are not used.
• The read value is always "0".
• Write has no effect on the operation.
These bits select the interval time.
WTC1 WTC0
0 0
0 1
1 0
1 1
This bit clears the counter for the watch prescaler.
Writing "0" : ignored and has no effect on the operation.
Writing "1" : initializes all counter bits to "1".
• The read value is always "0".
Note: When the output of the watch prescaler is selected as the count clock of the watchdog
timer, clearing the watch prescaler with this bit also clears the watchdog timer.
CHAPTER 13 WATCH PRESCALER
Function
Interval time select bits
(Subclock F = 32.768kHz)
CL
11
2 x 2/F (125ms)
CL
12
2 x 2/F (250ms)
CL
13
2 x 2/F (500ms)
CL
14
2 x 2/F (1.00s)
CL
197