M38B71M1 datasheet(70/110 Pages) RENESAS | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Part No.	M38B71M1

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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Maker	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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38B7 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

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, 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 (switching to the high-speed mode, a

power source voltage must be between 4.0 V and 5.5 V).

Fig. 77 Reset sequence

Fig. 76 Reset circuit example

(Note)

0.2VCC

Poweron

VCC

RESET

VCC

RESET

Power source

voltage detection

circuit

Power source

voltage

Reset input

voltage

Note : Reset release voltage ; Vcc=2.7 V

RESET

Internal

reset

Data

Address

SYNC

XIN: about 4000 cycles

XIN

FFFC

FFFD

ADH, ADL

1: The frequency relation of f(XIN) and f(

φ) is f(XIN)=4 • f(φ).

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

Notes

ADL

ADH

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M38B71M1 Datasheet(PDF) 70 Page - Renesas Technology Corp

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