參數(shù)資料
型號: MB90F372
廠商: Fujitsu Limited
英文描述: 16-bit Proprietary Microcontroller
中文描述: 16位微控制器專有
文件頁數(shù): 55/140頁
文件大?。?/td> 650K
代理商: MB90F372
MB90370/375 Series
55
4.
Watchdog timer
The watchdog timer is a 2-bit counter that uses the timebase timer’s supply clock as the count clock. After
activation, if the watchdog timer is not cleared within a given period, the CPU will be reset.
Features of watchdog timer :
Reset CPU at four different time intervals
Status bits to indicate the reset causes
(1) Register configuration of watchdog timer
(2) Block diagram of watchdog timer
Watchdog Timer Control Register
Bit number
WDTC
Address :0000A8
H
Read/write
Initial value
R
X
R
X
R
X
W
1
W
1
W
1
7
6
5
4
3
2
1
0
R
X
PONR
WRST
ERST
SRST
WTE
WT1
WT0
Watchdog timer control register (WDTC)
Watchdog timer
Start of watch mode
Start of sleep mode
Start of stop mode
reset generation
Counter
clear control
circuit
Count
clock
selector
Activation with CLR
2-bit
counter
Overflow
Watchdog
reset
generator
To the
internal
reset
generator
CLK
CLR
(Timebase timer counter)
One-half of HCLK
Sub-clock divide by 4
Watch timer counter
×
2
1
×
2
2
×
2
8
×
2
9
×
2
10
×
2
11
×
2
12
×
2
13
×
2
14
×
2
15
×
2
16
×
2
17
×
2
18
×
2
1
×
2
2
×
2
10
×
2
11
×
2
12
×
2
13
×
2
14
×
2
15
PONR
WRST ERST SRST
WTE
WT1
WT0
WDCS (from watch timer
control register, WTC)
2
4
4
HCLK : Oscillation clock
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