參數資料
型號: μPD780022
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數: 22/64頁
文件大?。?/td> 487K
代理商: ΜPD780022
22
μ
PD780021, 780022, 780023, 780024
Preliminary Data Sheet
Figure 5-5. Block Diagram of Watch Timer
Figure 5-6. Block Diagram of Watchdog Timer
f
X
/2
7
f
XT
f
W
f
W
2
4
f
W
2
5
f
W
2
6
f
W
2
7
f
W
2
8
f
W
2
9
Clear
9-bit prescaler
Clear
5-bit counter
INTWT
INTWTI
WTM7 WTM6 WTM5 WTM4
0
WTM1 WTM0
Watch timer mode
control register (WTM)
Internal bus
S
S
Oscillation
stabilization time
selection register
(OSTS)
Clock
input
control
circuit
INTWDT
RESET
WDT mode signal
3
OSTS2 OSTS1 OSTS0
WDCS2 WDCS1WDCS0
Internal bus
Division
circuit
Divided
clock
selection
circuit
Output
control
circuit
Division mode
selection circuit
RUN
WDTM4WDTM3
Watchdog timer
clock selection
register (WDCS)
Watchdog timer
mode register
(WDTM)
RUN
f
X
/2
8
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