EM73866 Ver la hoja de datos (PDF) - ELAN Microelectronics

Número de pieza

componentes Descripción

Fabricante

EM73866

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73866

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

LDIA #00h;

LDIA #03h;

ADDA #05h;

ADDA #0Dh;

ADDA #0Eh;

CF ZF

SF

-

1

1

-

0

1

-

0

1

-

0

0

-

0

0

ALU

The arithematic operation of 4-bit data is performed in ALU unit. There are 2 flags can be affected by the

result of ALU operation, ZF and SF. The operation of ALU can be affected by CF only.

ALU STRUCTURE

ALU supported user arithematic operation function, including : addition, subtraction and rotaion.

DATA BUS

ALU

ZF CF SF

ALU FUNCTION

(1) Addition:

For instruction ADDAM, ADCAM, ADDM #k, ADD #k,y .... ALU supports additional function.

The additional operation can affect CF and ZF. For additional operation, if the result is "0", ZF will be

"1", otherwise, not equal "0", ZF will be "0". When the addition operation has a carry-out, CF will be "1",

otherwise, CF will be "0".

EXAMPLE:

Operation

Carry Zero

3+4=7

7+F=6

0+0=0

8+8=0

0

0

1

0

0

1

1

1

(2) Subtraction:

For instruction SUBM #k, SUBA #k, SBCAM, DECM... ALU supports user subtraction function. The

subtraction operation can affect CF and ZF, For subtraction operation, if the result is negative, CF will

be "0", it means a borrow out, otherwise, if the result is positive, CF will be "1". For ZF, if the result

of subtraction operation is "0", the ZF will be "1", otherwise, ZF will be "1".

* This specification are subject to be changed without notice.

12.29.1999 11

Share Link: