5

* This specification are subject to be changed without notice.

EM73C63

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

8.11.2000

B

XA2

:

; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

BANK 2

XB1 :

:

:

BXB

:

XB2 :

:

B

XB2

:

; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

BANK 3

XC1 :

:

:

BXC

:

XC2 :

:

B

XC2

Fixed data can be read out by table-look-up instruction. Table-look-up instruction requires the Data point (DP)

to indicate the ROM address in obtaining the ROM code data (Except bank0) :

LDAX

Acc

←

←

←

←

← ROM[DP]

L

LDAXI

Acc

←

←

←

←

← ROM[DP]

DP is a 12-bit data register that stores the program ROM address as pointer for the ROM code data.

User has to initially load ROM address into DP with instructions "STADPL", and "STADPM", "STADPH",

then to obtain the lower nibble of ROM code data by instruction "LDAX" and higher nibble data by instruction

"LDAXI".

PROGRAM EXAMPLE: Read out the ROM code of address 1777h by table-look-up instruction.

LDIA #07h;

STADPL

; [DP]

STADPM

; [DP]

STADPH

; [DP]

:

OUT #00H, P3 ; Set in bank 1

LDL #00h;

LDH #03h;

LDAX

; ACC

← 6h

STAMI

; RAM[30]

← 6h

LDAXI

; ACC

← 5h

STAM

; RAM[31]

← 5h

;

ORG 1777h

DATA 56h;

DATA RAM ( 500-nibble )

A total 500 - nibble data RAM is available from address 000 to 1FFh

Data RAM includes the zero page region, stacks and data areas.