4250 datasheet(26/59 Pages) RENESAS

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4250 データシート(PDF) 26 Page - Renesas Technology Corp

部品番号	4250

部品情報	SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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メーカー	RENESAS [Renesas Technology Corp]

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MITSUBISHI MICROCOMPUTERS

4250 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

Fig. 22 Power-on reset circuit example

(2) Internal state at reset

Table 11 shows port state at reset, and Figure 23 shows

internal state at reset (they are retained after system is released

from reset).

Table 11 Port state at reset

The contents of timers, registers, flags and RAM except shown

in Figure 23 are undefined, so set the initial value to them.

Name

D0, D1, D2/C, D3/K

S0–S3

G0/INT, G1/TOUT

G2, G3

F0, F1

State

High impedance

(Note)

Function

D0, D1, D2/C, D3/K

S0–S3

G0/INT, G1

G2, G3

F0, F1

Note: Output latch is set to “1.”

(1) Power-on reset

Reset can be automatically performed at power on (power-on

reset) by connecting a resistor, a diode, and a capacitor to

RESET

pin. Connect RESET pin and the external circuit at the

shortest distance.

VDD

RESET pin voltage

Internal reset signal

Power-on

RESET

This symbol represents a parasitic diode.

Internal reset

signal

Reset state

Reset released

Note: Applied potential to RESET pin

must be 7 V or less.

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同様の説明 - 4250

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