Samsung S3F80JB manual LDW Load Word, Rr Iml, LDW RR6,RR4

Models: S3F80JB

1 346
Download 346 pages 34.13 Kb
Page 186
Image 186

INSTRUCTION SET

S3F80JB

 

 

LDW — Load Word

LDW dst,src

Operation: dst src

The contents of the source (a word) are loaded into the destination. The contents of the source are unaffected.

Flags: No flags are affected.

Format:

opc

src

dst

Bytes

Cycles

Opcode

Addr Mode

 

 

(Hex)

dst

src

3

8

C4

RR

RR

 

8

C5

RR

IR

opc

dst

src

4

8

C6

RR IML

Examples: Given: R4 = 06H, R5 = 1CH, R6 = 05H, R7 = 02H, register 00H = 1AH, register 01H = 02H, register 02H = 03H, and register 03H = 0FH:

LDW

RR6,RR4

R6

= 06H, R7

= 1CH, R4 = 06H, R5 = 1CH

LDW

00H,02H

Register 00H

= 03H, register 01H = 0FH,

 

 

 

register 02H

= 03H, register 03H = 0FH

LDW

RR2,@R7

R2

= 03H, R3

= 0FH,

LDW

04H,@01H

Register 04H

= 03H, register 05H = 0FH

LDW

RR6,#1234H

R6

= 12H, R7

= 34H

LDW

02H,#0FEDH

Register 02H

= 0FH, register 03H = 0EDH

In the second example, please note that the statement "LDW 00H,02H" loads the contents of the source word 02H, 03H into the destination word 00H, 01H. This leaves the value 03H in general register 00H and the value 0FH in register 01H.

The other examples show how to use the LDW instruction with various addressing modes and formats.

6-58

Page 186
Image 186
Samsung S3F80JB manual LDW Load Word, Rr Iml, LDW RR6,RR4