M38862EDFS View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38862EDFS

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 2.7 V and 5.5

V (4.0 V to 5.5 V for flash memory version), and the oscillation

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 address FFFC16 (low-order byte). Make sure

that the reset input voltage is less than 0.54 V for VCC of 2.7 V. For

flash memory version, make sure that the reset input voltage is

less than 0.8 V for Vcc of 4.0 V.

MITSUBISHI MICROCOMPUTERS

3886 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

RESET

RESET

Power source

VCC voltage

0V

Reset input

voltage

0V

Poweron

(Note)

0.2VCC

Note : Reset release voltage ; Vcc=2.7 V

(Vcc = 4.0 V for flash memory version)

VCC

Power source

voltage detection

circuit

Fig. 55 Reset circuit example

XIN

φ

RESET

Internal

reset

Address

Data

SYNC

?

?

?

?

FFFC FFFD ADH,L

Reset address from the vector table.

?

?

?

?

ADL

ADH

XIN: 10.5 to 18.5 clock 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. 56 Reset sequence

56

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