EM78P813

8-bit OTP Micro-controller

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* This specification is subject to change without notice.

10

2004/8/19

(V1.6)

VIII Expand Program/Data ROM interface

Pin

I/O

Description

EXD0 ~ EXD7

I/O

Expand Program/Data memory Data Bus

RD

O

Expand Program/Data memory Read request output

WR

O

Expand Program/Data memory Write request output

CS

O

Expand Program/Data memory CS request output

EXA-1~EXA19

O

Expand Program/Data memory Address Bus

EXSEL

I

0/1

Internal 64K Program ROM select used/unused

CHIPSEL Pin : EM78813 or EM78815 function select . In EM78813 mode , Key strobe pin are share with SEG50 ~ SEG

65. If select to EM78815 mode , Key strobe pin are share with I/O Port8 and Port9. SEG34 ~SEG65 pin will switch

to expand flash memory interface.

Connect to ground

EM78813 mode

Connect to VDD

EM78815 mode

EM78813 mode

COM2

SEG

V1

V2

V4

V5

GND

30us

V1

V2

V4

V5

GND

V1

V2

V4

V5

GND

Fig.4(a) : EM78813 mode Key scan signal(share with SEG pin)