UPD6125A Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD6125A

4-BIT SINGLE CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION

NEC => Renesas Technology 

µPD6125A, 6126A

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 µF capacitor across the AC pin and the VSS.

Charge mode

VDD

0.1 µF

Charge start instruction

Execute HALT instruction

immediately before NOP.

(Charge for 0.4 ms or more)

Discharge mode

0.1 µF

Discharge start instruction

Discharge starts after the NOP

instruction execution.

(Discharge time is about 5 ms from VDD to Vth)

Charge-discharge V

pattern

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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