Samsung S3F80JB manual COM Complement

Models: S3F80JB

1 346
Download 346 pages 34.13 Kb
Page 157
Image 157

S3F80JBINSTRUCTION SET

COM — Complement

COM

dst

 

Operation:

dst NOT dst

 

The contents of the destination location are complemented (one's complement); all "1s" are

 

changed to "0s", and vice-versa.

Flags:

C: Unaffected.

 

Z:

Set if the result is "0"; cleared otherwise.

 

S:

Set if the result bit 7 is set; cleared otherwise.

 

V:

Always reset to "0".

 

D:

Unaffected.

 

H:

Unaffected.

Format:

 

Bytes Cycles Opcode

Addr Mode

(Hex)

dst

opc

dst

2

4

60

R

 

4

61

IR

Examples: Given: R1 = 07H and register 07H = 0F1H:

COM

R1

R1

= 0F8H

COM

@R1

R1

= 07H, register 07H = 0EH

In the first example, destination working register R1 contains the value 07H (00000111B). The statement "COM R1" complements all the bits in R1: all logic ones are changed to logic zeros, and vice-versa, leaving the value 0F8H (11111000B).

In the second example, Indirect Register (IR) addressing mode is used to complement the value of destination register 07H (11110001B), leaving the new value 0EH (00001110B).

6-29

Page 157
Image 157
Samsung S3F80JB manual COM Complement