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EM73A89B

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73A89B

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

PROGRAM EXAMPLE: Load the data of RAM address "143h" to RAM address "032h".

OUT #0001B,P9

; RAM bank1

LDL #3h

; LR← 3

LDH #4h

; HR← 4

LDAM

; Acc← RAM[134h]

OUT #0000B,P9

; RAM bank0

LDL #2h

; LR← 2

LDH #3h

; HR← 3

STAM

; RAM[023h]← Acc

(2) Direct addressing mode:

The address in the bank is directly specified by 8 bits code of the second byte in the instruction field.

instruction field

xxxx xxxx

P9(1,0)

RAM address

xxxx xxxx

PROGRAM EXAMPLE: Load the data of RAM address "143h" to RAM address "023h".

OUT #0001B,P9

LDA 43h

; Acc← RAM[143h]

OUT #0000B,P9

STA 23h

; RAM[023h]← Acc

(3) Zero-page addressing mode:

The zero-page is in the bank 0 (address 000h~00Fh). The address is the lower 4 bits code of the second byte

in the instruction field.

instruction field

yyyy

RAM address 00 0000 yyyy

PROGRAM EXAMPLE: Write immediate "0Fh" to RAM address "005h".

STD #0Fh, 05h

; RAM[05h]← 0Fh

* This specification are subject to be changed without notice.

8.16.2001 9

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