UPD17708 datasheet(316/356 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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316 / 356 page

316

µPD17704, 17705, 17707, 17708, 17709

21.4 Relationship between CE Reset and Power-ON Reset

On the first application of supply voltage VDD, power-ON reset and CE reset are performed at the same time.

The reset operations at this time are described in 21.4.1 through 21.4.3.

21.4.4 describes the points to be noted when raising supply voltage VDD.

21.4.1 If VDD pin and CE pin go high at the same time

Figure 21-7 (a) shows the operation.

At this time, the program starts from address 0000H because of power-ON reset.

21.4.2 If CE pin rises in forced halt status set by power-ON reset

Figure 21-7 (b) shows the operation.

At this time, the program starts from address 0000H because of power-ON reset, in the same manner as 21.4.1.

21.4.3 If CE pin rises after power-ON reset

Figure 21-7 (c) shows the operation.

At this time, the program starts from address 0000H because of power-ON reset, and the program starts from

address 0000H again at the rising edge of the next basic timer 0 carry FF setting signal because of CE reset.

UPD17708 Scheda tecnica(PDF) 316 Page - NEC