M38223M2FS View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38223M2FS

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

RESET CIRCUIT

To reset the microcomputer, RESET pin should be held at an “L”

level for 2 µs or more. Then the RESET pin is returned to an “H”

level (the power source voltage should be between VCC(min.) and

5.5 V, and the quartz-crystal oscillator should be stable), reset is

released. After the reset is completed, the program starts from the

address contained in address FFFD16 (high-order byte) and ad-

dress FFFC16 (low-order byte). Make sure that the reset input

voltage meets VIL spec. when a power source voltage passes

VCC(min.).

MITSUBISHI MICROCOMPUTERS

3822 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

RESET

Power

source

VCC voltage

0V

Reset input

voltage

0V

Power on

VIL spec.

RESET

VCC

Power source voltage

detection circuit

Fig. 39 Reset Circuit Example

XIN

φ

RESET

Internal

reset

Address

Data

SYNC

Reset address from

vector table

?

?

?

?

FFFC FFFD ADH, ADL

ADL

ADH

XIN : about 8000 cycles

Notes 1: The frequency relation of f(XIN) and f(φ) is f(XIN) =8•f(φ)

2: The question marks (?) indicate an undefined state that depends on the previous state.

Fig. 40 Reset Sequence

41

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