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MB90487BPFV Datasheet(PDF) 66 Page - Fujitsu Component Limited.

Part # MB90487BPFV
Description  16-bit Proprietary Microcontroller
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Manufacturer  FUJITSU [Fujitsu Component Limited.]
Direct Link  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MB90487BPFV Datasheet(HTML) 66 Page - Fujitsu Component Limited.

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MB90480/485 Series
66
14. Watchdog timer
The watchdog timer is a 2-bit counter that uses the output from the timebase timer or watch timer as a count
clock signal, and will reset the CPU if not cleared within a predetermined time interval after it is activated.
(1) Register List
(2) Block Diagram
Watchdog timer control register (WDTC)
0000A8H
Read/write
Initial value
X
R
X
R
X
R
X
W
1
W
1
W
1
76
5
4
3
2
1
0
R
X
PONR
WRST
ERST
SRST
WTE
WT1
WT0
Reserved
PONR
WRST ERST SRST WTE
WT1
WT0
× 21 × 22
× 28 × 29 × 210 × 211 × 212 × 213 × 214 × 215 × 216 × 217 × 218
× 21
SCLK
CLR
CLR
× 22
× 28 × 29 × 210 × 211 × 212 × 213 × 214 × 215 × 216 × 217 × 218
2
4
4
Watchdog timer control register (WDTC)
Watchdog timer
Watch mode start
Timebase timer
mode start
Sleep mode start
Hold status start
Counter
clear
control
circuit
Count
clock
selector
2-bit
counter
Watchdog
reset
generator
circuit
Clear
Internal
reset
generator
circuit
CLR and
start
Time-base counter
HCLK
× 2
HCLK : Oscillator clock
SCLK : Sub clock
Watch timer control
register (WTO)
WDCS bit
Clock select register
(CKSCR)
SCM bit
Stop mode
start
Re-
served


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