EM78P813

8-bit OTP Micro-controller

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* This specification is subject to change without notice.

47

2004/8/19

(V1.6)

MOV

RB_PAGE0 , A

; Set external LCD driver start address Column 0

MOV

A , @0x00;

MOV

R7_PAGE1 , A;

MOV

R8_PAGE1 , A;

MOV

R9_PAGE1 , A

;Start address : 0x00000

MOV

A , @0x0B

IOW

IOCB_PAGE1

;select data mode

CN1:

MOV

A , R6_PAGE1

;read data from Data ROM and address flag increase

MOV

RB_RAGE0 , A

;write data to external LCD driver.

JMP

LOOP

Bit 1(DIS) : External LCD driver DATA/INSTRUCTION switch.

0/1

INSTRACTION/DATA

When EXLCD equal to 1 and DIS bit equal to 0 , MUC will transmit/receive INSTRUCTION. A0(PortC7) will

output 0. If DIS bit set to 1, MUC will transmit/receive DATA. A0(PortC4) will output 1

Bit 2(CSSON) : External LCD driver select enable

CS1..CS2

CSSON

CSS0

LOW

HIGH

0

X

-

CS1,CS2

1

0

CS1

CS2

1

1

CS2

CS1

Example( for EMC 65x132 LCD driver ):

MOV

A, @0x01

IOW

IOCB_PAGE1

;Select external LCD driver & INSTRUCTURE mode

MOV

A,@0xB0

MOV

RB,A

;Select external LCD driver COM0

MOV

A,@0x10

MOV

RB,A

;Select external LCD driver SEG Upper 4-bit = 0

MOV

A,@0x00

MOV

RB,A

;Select external LCD driver SEG Lower 4-bit = 0

MOV

A,@0x03

IOW

IOCB_PAGE1

;switch to DATA mode

MOV

A,@0xFF

MOV

RB,A

;write 0xFF to COM0 &SEG0

:

User must assign external LCD address at first time. After writing or reading the display data, The SEGMENT

address is automatically incremented. So that the MUC can continuously write or read data to the address.

Bit 3(CSS) : External LCD driver chip select bit.

0/1

chip1 / chip2

Bit 4..Bit 5(RES0 ~ RES1) : Touch panel bias resister switch..

Bit 6(CWPWR) : CAS decoder power control.

0/1

Power off / Power on.

Bit 7(EXA17) : Expand Data ROM start address MSB. This bit can not set unless CHIPSEL

and EXSEL pin connect to VDD.