參數(shù)資料
型號： UPD61P24
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION
中文描述： 4位單片機的遙控傳輸
文件頁數(shù)： 15/36頁
文件大小： 252K
代理商： UPD61P24
μ
PD61P24
15
15. AC PIN (ALL CLEAR PIN)
Internal part of the CPU including the program counter can be reset by setting the AC pin to the low level.
Watchdog Timer Function
A power-on reset function and a CR watchdog timer function, that can be controlled by program, can be realized
by connecting a 0.1
μ
F capacitor across the AC pin and the V
SS
.
V
DD
0.1 F
0.1 F
V
V
DD
V
thL
t
Charge mode
Charge start instruction
Execute HALT instruction
immediately before NOP.
(Charge for 0.4 ms or more)
Discharge mode
Charge-discharge
pattern
Discharge start instruction
Discharge starts after the NOP
instruction execution.
(Discharge time is about 5 ms from V
DD
to V
thL
)
The pattern must be
controlled by the program,
in such a manner that
the C charge level will not
go below V
thL
.
Caution When the watchdog timer function is not used, switch to charging mode by executing a NOP
instruction immediately before a HALT instruction at the beginning of the program. (Be sure to
connect the capacitor.)
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