参数资料
型号: MB90523PFV
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP120
封装: PLASTIC, QFP-120
文件页数: 40/106页
文件大小: 1541K
代理商: MB90523PFV
MB90520 Series
39
3. Watchdog Timer
The watchdog timer is a 2-bit counter operating with an output of the timebase timer and resets the CPU when
the counter is not cleared for a preset period of time.
(1) Register Configuration
(2) Block Diagram
Watchdog timer control register (WDTC)
Address
0000A8H
PONR STBR WRST ERST
SRST
WTE
WT1
WT0
R : Read only
W: Write only
X : Indeterminate
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
RR
R
W
Initial value
XXXXXXXX B
HCLK : Oscillation clock frequency
PONR STBR WRST ERST SRST WTE
WT1
WT0
Watchdog timer control register (WDTC)
Start sleep-mode
CLR and start
Watchdog timer
Overflow
To internal reset
generation circuit
Counter clear
control circuit
Count clock
selector
2-bit
counter
Watchdog timer
reset generation
circuit
Clear
Divided-by-2
of HCLK
(Timebase timer counter)
× 21 × 22 ... × 28 × 29 × 210 × 211 × 212 × 213 × 214 × 215 × 216 × 217 × 218
CLR
2
4
CLR
Start stop-mode
Start hold status
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