EM78P813

8-bit OTP Micro-controller

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* This specification is subject to change without notice.

46

2004/8/19

(V1.6)

If EXLCD equal to 0, internal LCD driver selected . PortB and PortC output are decided on IOC9 and IOCA Page1.

When EXLCD equal to 1, PortB and PortC are switch to external LCD driver control pin. At this time, when user execute

read or write PORTB instruction, PORTC timing characteristic plot is follow below.

PORTB

DATA

WR(PC2)/

RD(PC3)

CS(PC0/PC1)

A0(PC4)

Taw

Tcyc

Tcc

Tacc

Tds

Tah

Tdh

PORTB

DATA

Toh

Fig.31 timing characteristic of external LCD driver data read/write

Rated value

Symbol

Applicable

pins

Min

Max

Unit

Tah

A0

0

Taw

A0

0

Tcyc

A0

150

Tcc

WR/RD

60

Tds

D0 ~D7

20

Tdh

D0 ~D7

10

Tacc

D0 ~D7

-

60

Toh

D0 ~D7

10

40

ns

Tah : Address hold time

Taw : Address setup time

Tcyc : System cycle time

Tcc : Pulse width

Tds : Data setup time

Tdh : Data hold time

Tacc : Read access time

Toh : Output disable time

User can operate in coordination on chip Data ROM address automatic increase function to write a large number of

data from internal Data ROM to external LCD RAM.

Example( To collocate EM9L8580 LCD driver ):

START:

MOV

A , @0x0C;

IOW

IOC5_PAGE0

;Set Data ROM address automatic increase after read/write data

MOV

A , @0x09

IOW

IOCB_PAGE1

;External LCD driver chip 1 INSTRUCTION mode select .

MOV

A , @0xB0;

MOV

RB_PAGE0 , A

;Set external LCD driver start address PAGE 0

MOV

A , @0x10

MOV

RB_PAGE0 , A

MOV

A , @0x00