UPD17708 datasheet(191/356 Pages) NEC

Il numero della parte	UPD17708

Spiegazioni elettronici	4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM

PDF	356 Pages

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Produttore elettronici	NEC [NEC]

Homepage	http://www.nec.com/

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µPD17704, 17705, 17707, 17708, 17709

13.6.6 Error of timer 3

Timer 3 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 setting the TM3EN flag.

Therefore, an error of 0 to +1 clocks occurs when the TM3EN flag is set, and an error of –1 to 0 clocks

occurs when 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.

13.6.7 Cautions on using timer 3

Timer 3 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 3, use basic timer 0 instead.

When timer 3 is used, the three output port pins multiplexed with the D/A converter pins, P1B2/PWM2 through

P1B0/PWM0, are automatically set in the general-purpose output port mode.

UPD17708 Scheda tecnica(PDF) 191 Page - NEC