4552 datasheet(48/145 Pages) RENESAS

Part #	4552

Description	SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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48 / 145 page

Rev.3.02

Dec 22, 2006

page 48 of 142

REJ03B0023-0302

4552 Group

RESET FUNCTION

System reset is performed by applying “L” level to RESET pin for

1 machine cycle or more when the following condition is satisfied;

the value of supply voltage is the minimum value or more of the

recommended operating conditions.

Then when “H” level is applied to RESET pin, software starts from

address 0 in page 0.

Fig. 37 Reset release timing

Fig. 38 RESET pin input waveform and reset operation

RESET

0.3VDD

0.85VDD

(Note)

Note: Keep the value of supply voltage to the minimum value

or more of the recommended operating conditions.

Reset input

1 machine cycle or more

Program starts

(address 0 in page 0)

On-chip oscillator (internal oscillator)

is

counted 1376 times.

f(RING)

RESET

Program starts

(address 0 in page 0)

On-chip oscillator (internal oscillator)

is counted 1376 times.

Note: The number of clock cycles depends on the internal state of

the microcomputer when reset is performed.

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