UPD17708 datasheet(319/356 Pages) NEC

Nome de Peças	UPD17708

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

PDF	356 Pages

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Fabricante Electrônico	NEC [NEC]

Página de início	http://www.nec.com/

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319

µPD17704, 17705, 17707, 17708, 17709

(2) Releasing from clock stop status

If the device is released from the backup status when supply voltage VDD is backed up at 2.2 V by using the

clock stop status, VDD must be raised to 3.5 V or more within tSET/2 after the clock stop status has been released

by INT pin interrupt or high level input to port 0D.

As shown in Figure 21-9, the device is released from the clock stop status by means of CE reset. However,

because the power-ON clear voltage is changed to 3.5 V tSET/2 after the clock stop status has been released,

power-ON reset is effected unless VDD is 3.5 V or higher.

The same applies when VDD is raised.

Figure 21-9. Releasing from Clock Stop Status

P0D

BTM0CY flag

setting pulse

XOUT

5 V

3.5 V

2.2 V

0 V

Power-ON

clear signal

Power-ON

clear voltage

Backup in clock stop

status

Halt status

tSET/2

Power-ON clear voltage changes

to 3.5 V at this point.

Therefore, VDD must be 3.5 V

or higher before this point.

Normal operation

Backup

STOP s instruction

VDD

Program starts

Power-ON clear voltage changes

to 2.2 V at this point.

Therefore, VDD must be 3.5 V

or higher before this point.

tSET: basic timer 0 setting time

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