參數(shù)資料
型號(hào)： MB90F822APF
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： 16-bit Proprietary Microcontroller
中文描述： 16-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP80
封裝： 0.80 MM PITCH, PLASTIC, QFP-80
文件頁數(shù)： 43/100頁
文件大?。?/td> 992K
代理商： MB90F822APF
MB90820 Series
43
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
Indicate the reset causes by status bits
(1) Register configuration
(2) Block diagram
Address: 0000A8
H
7
6
5
4
3
2
1
0
Watchdog Timer Control Register
WDTC
Bit
R
X
R
X
R
X
R
X
W
1
W
1
W
1
Initial value
Read/write
PONR
WRST
ERST
SRST
WTE
WT1
WT0
X
Watchdog timer control register (WDTC)
PONR
WRST ERST SRST WTE
WT1
WT0
Watchdog timer
2
Start of sleep mode
Start of hold status mode
Start of stop mode
Counter clear
control circuit
Count clock
selector
2-bit
counter
Watchdog
reset generator
Activation
with CLR
Over
flow
CLR
CLR
Clear
To the internal
reset generator
Timebase timer counter
Divided by 1/2 of HCLK
HCLK : Oscillation clock frequency
4
×
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
…
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