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M37640E8FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

Ver 1.4

MITSUBISHI MICROCOMPUTERS

7640 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

1.26 RESET

This device is reset if the RESET pin is held low for a

minimum of 2ms while the supply voltage is set be-

tween 4.15 and 5.25V. When the RESET pin returns

high, the reset sequence commences (see Figure

1.99). To allow the oscillation source the time to sta-

bilize, a delay is generated by the countdown of Timer

1 and Timer 2 cascaded with FF16 loaded in Timer 1

and 0116 loaded in Timer 2. After the reset sequence

completes, program execution begins at the address

whose high-order byte is the contents of address

FFFA16 and whose low-order byte is the contents of

address FFFB16.

Φout

Reset

SYNCout

Address

Data

?

?

?

?

?

FFFA FFFB ADL ADH

?

?

?

?

?

ADH

ADL

First

Opcode

Timer countdown from 01FF16

Fig. 1.99. Internal Processing Sequence after RESET

79

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