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M38C88EE-FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

PRELIMINARY NSocothimcaene:gpTeah.riasmisetnrioct laimfiintsalasrepescuibfijceacttioton.

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 address FFFC16

(low-order byte). Make sure that the reset input voltage is less than

0.2Vcc when a power source voltage passes VCC (min.).

MITSUBISHI MICROCOMPUTERS

38C8 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

RESET

Power source

VCC voltage

0V

Reset input

voltage

0V

Poweron

(Note)

0.2VCC

Note : Reset release voltage ; VCC=3.0 V.

RESET

VCC

Power source

voltage detection

circuit

Fig. 33 Reset circuit example

XIN

φ

RESET

Internal

reset

Address

Data

SYNC

Reset address from

vector table

?

?

?

?

FFFC FFFD ADH, ADL

ADL

ADH

XIN : about 8200 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. 34 Reset sequence

35

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