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4250

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS

4250 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

(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

Internal reset

signal

VDD

RESET pin voltage

Reset state

Internal reset signal

This symbol represents a parasitic diode.

Note: Applied potential to RESET pin

must be 7 V or less.

Power-on

Reset released

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).

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

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

Table 11 Port state at reset

Name

Function

D0, D1, D2/C, D3/K D0, D1, D2/C, D3/K

S0–S3

S0–S3

G0/INT, G1/TOUT G0/INT, G1

G2, G3

G2, G3

F0, F1

F0, F1

Note: Output latch is set to “1.”

State

High impedance

(Note)

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