7480 datasheet(45/98 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

7480/7481 GROUP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PRELIMINAR

Notice:

This

is not

a final

specification.

Some

parametric

limits

are

subject

to change.

Reset Circuit

The microcomputer is put into a reset status by holding the

_____

RESET pin at the “L” level for 2

µs or more when the power source

voltage is 2.7 to 5.5 V and XIN is in stable oscillation.

_____

After that, this reset status is released by returning the RESET pin

to the “H” level. The program starts from the address having the

contents of address FFFF16 as high-order address and the con-

tents of address FFFE16 as low-order address.

Note that the reset input voltage should be 0.32 V or less when

the power source voltage passes 2.7 V.

Fig. 47 Reset circuit diagram

Fig. 48 Reset sequence

RESET

VCC

RESET

VCC

Power source

voltage

Reset input

voltage

0.12VCC

Power ON

(Note)

Note : Reset release voltage VCC = 2.7 V

Power source

voltage

detecting circuit

FFFE16

FFFF16

ADH,L

ADL

ADH

XIN

RESET

Internal reset

Address

Data

SYNC

XIN 2048 clock cycle

Reset address from

the vector table

Notes 1 : The frequency relation between f(X IN) and

is f(XIN)=2·f( ).

2 : The mark “?” means that the address is changeable depending

on the previous state.

φφ

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