M38504M6-201FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M38504M6-201FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

RESET CIRCUIT

To reset the microcomputer, RESET pin must 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 must be between 2.7 V and 5.5 V,

and the oscillation must be stable), reset is released. After the re-

set 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.

MITSUBISHI MICROCOMPUTERS

3850 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=2.7 V

RESET

VCC

Power source

voltage detection

circuit

Fig. 29 Reset circuit example

XIN

φ

RESET

RESETOUT

Address

Data

SYNC

?

?

?

?

FFFC FFFD ADH,L

Reset address from the vector table.

?

?

?

?

ADL

ADH

XIN: 8 to 13 clock cycles

Notes 1: The frequency relation of f(XIN) and f(φ) is f(XIN) = 2 • f(φ).

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

3: All signals except XIN and RESET are internals.

Fig. 30 Reset sequence

25

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