Fujitsu 8FX

MB95630H Series
MN702-00009-2v0-E FUJITSU SEMICONDUCTOR LIMITED 113
CHAPTER 9 WATCH PRESCALER
9.2 Configuration
9.2 Configuration
The watch prescaler consists of the following blocks:
• Watch prescaler counter
• Counter clear circuit
• Interval timer selector
• Watch prescaler control register (WPCR)
■ Block Diagram of Watch Prescaler
Figure 9.2-1 Block Diagram of Watch Prescaler
Counter clear
circuit
Interval timer
selector
WTIF WTIE - - WTC1 WTC0 WCLR
Watch prescaler counter (counter)
Watch prescaler control register (WPCR)
Resets, or stops
subclock oscillation or
sub-CR clock oscillation
Interrupt
of watch
prescaler
Watchdog timer clear
FCL divided by 2
F
CRL divided by 2
FCL : Subclock
F
CRL : Sub-CR clock
Counter clear
Software watchdog timer
WTC2
SYCC:SCM[2:0]
SYCC2:SRDY,
SYCC2:SCRDY
×
2
1
×
2
2
×
2
3
×
2
4
×
2
5
×
2
6
×
2
7
×
2
8
×
2
9
×
2
10
×
2
11
×
2
12
×
2
13
×
2
14
×
2
15
×
2
16
×
2
17