UPD17708 datasheet(171/356 Pages) NEC

No. de pieza	UPD17708

Descripción Electrónicos	4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM

PDF	356 Pages

Scroll/Zoom	100%

Fabricante Electrónico	NEC [NEC]

Página de inicio	http://www.nec.com/

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171 / 356 page

171

µPD17704, 17705, 17707, 17708, 17709

SUBC

DBF1, #TM01200 SHR4 AND 0FH

SKT1

; 1200

µs or more?

BBB

Processing C

EI_RETI

BBB:

Processing B

EI_RETI:

GET

DBF, DBFSTK

; Restores data buffer

RETI

; Return

END

13.3.5 Error of timer 0

Timer 0 has an error of up to 1 basic clock in the following cases.

(1) On starting/stopping counter

The counter is started or stopped by ANDing the open/close condition of the gate and TM0EN flag setting

condition.

Therefore, an error of 0 to +1 clocks occurs when the gate is opened or the TM0EN flag is set, and an

error of –1 to 0 clocks occurs when the gate is closed or the flag is reset.

In all, an error of

±1 count occurs.

(2) On resetting counter operation

An error of 0 to +1 clocks occurs when the counter is reset.

(3) On selecting basic clock during counter operation

An error of 0 to +1 clocks of the newly selected clock occurs.

13.3.6 Cautions on using timer 0

Timer 0 interrupt may occur simultaneously with the other timer interrupts and CE reset. If it is necessary

to update the timer at CE reset, do not use timer 0, use basic timer 0 instead.

UPD17708 Datasheet(PDF) 171 Page - NEC