4250 datasheet(32/59 Pages) RENESAS

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4250 データシート(PDF) 32 Page - Renesas Technology Corp

部品番号	4250

部品情報	SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

PDF	59 Pages

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メーカー	RENESAS [Renesas Technology Corp]

ホームページ	http://www.renesas.com

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MITSUBISHI MICROCOMPUTERS

4250 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

t/2 (S)

t (S)

VDD(V)

VSS(V)

Fig. 30 External clock input waveform

Key-on wakeup

When system returns from RAM back-up state by using the

G0/INT pin, select the return edge (rising edge or falling edge)

with the bit 2 of register K0 according to the external state

before going into the RAM back-up state.

When system returns from RAM back-up state by using the

ports G1–G3 and S0–S3, set the port using the key-on wakeup

function selected with register K0 to “H” level before going into

the RAM back-up state.

G0/INT pin and ports G1–G3, S0–S3 share the circuit which is

used to detect the edge and to recognize “L” level.

The G0/INT pin cannot be set to “no key-on wakeup.”

External clock input waveform

When the external clock is used, open XOUT pin, and input the

clock waveform into XIN pin shown below. (Refer to Figure 30)

•Duty ratio = 50 %.

•“H” level input voltage=VDD (V), “L” level input voltage=VSS (V).

CR oscillation constant

Use the external 30 pF capacitor and enable to change the

frequency by the external resistor.

Test the system sufficiently because the oscillation constant

depends on the ROM type (mask ROM or PROM).

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同様の説明 - 4250

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