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UPD6600AGS Datasheet

  • UPD6600AGS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMI...

  • 36頁(yè)

  • NEC   NEC

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碌
PD6124A, 6600A
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
碌
F capacitor across the AC pin and the V
SS
.
V
DD
Charge mode
Charge start instruction
0.1
碌
F
Execute HALT instruction
immediately before NOP.
(Charge for 0.4 ms or more)
Discharge mode
Discharge start instruction
0.1
碌
F
Discharge starts after the NOP
instruction execution.
(Discharge time is about 5 ms from V
DD
to V
thL
)
Charge-discharge
pattern
V
V
DD
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
.
t
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.)
16

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