M38B53M4-059FP datasheet(76/355 Pages) MITSUBISHI

76 / 355 page

38B5 Group User’s Manual

1-60

HARDWARE

FUNCTIONAL DESCRIPTION

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 0.5 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. 69 Reset sequence

Fig. 68 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

M38B53M4-059FP 데이터시트(PDF) 76 Page - Mitsubishi Electric Semiconductor

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