EM73982 Просмотр технического описания (PDF) - ELAN Microelectronics

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EM73982

4-BIT MICROCONTROLLER

ELAN Microelectronics 

EM73982

4-BIT MICROCONTROLLER

(3) Status Flag ( SF )

The SF is affected by instruction operation and system status.

a. SF is initiated to "1" for reset condition.

b. Branch instruction is decided by SF, when SF=1, branch condition will be satisified, otherwise,

branch condition will not be satisified by SF = 0.

PROGRAM EXAMPLE:

Check following arithematic operation for CF, ZF, SF

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

* This specification are subject to be changed without notice.

11.30.2001 4

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