Samsung S3F80JB manual TCM Test Complement Under Mask, R0,R1 = 0C7H, R1 = 02H, Z =

Models: S3F80JB

1 346
Download 346 pages 34.13 Kb
Page 212
Image 212

INSTRUCTION SETS3F80JB

TCM — Test Complement Under Mask

TCM dst,src

Operation: (NOT dst) AND src

This instruction tests selected bits in the destination operand for a logic one value. The bits to be tested are specified by setting a "1" bit in the corresponding position of the source operand (mask). The TCM statement complements the destination operand, which is then ANDed with the source mask. The zero (Z) flag can then be checked to determine the result. The destination and source operands are unaffected.

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 cleared to "0".

 

D:

Unaffected.

 

H:

Unaffected.

Format:

 

 

 

Bytes Cycles

Opcode

Addr Mode

 

(Hex)

dst

src

opc

dst src

 

 

 

 

opc

src

dst

 

 

 

2

4

62

r

r

 

6

63

r

lr

3

6

64

R

R

 

6

65

R

IR

opc

dst

src

3

6

66

R

IM

Examples: Given: R0 = 0C7H, R1 = 02H, R2 = 12H, register 00H = 2BH, register 01H = 02H, and register 02H = 23H:

TCM

R0,R1

R0

= 0C7H, R1 = 02H, Z = "1"

TCM

R0,@R1

R0

= 0C7H, R1 = 02H, register 02H = 23H, Z = "0"

TCM

00H,01H

Register 00H

= 2BH, register 01H = 02H, Z = "1"

TCM

00H,@01H

Register 00H

= 2BH, register 01H = 02H,

 

 

 

register 02H

= 23H, Z = "1"

TCM

00H,#34

Register 00H

= 2BH, Z = "0"

In the first example, if working register R0 contains the value 0C7H (11000111B) and register R1 the value 02H (00000010B), the statement "TCM R0,R1" tests bit one in the destination register for a "1" value. Because the mask value corresponds to the test bit, the Z flag is set to logic one and can be tested to determine the result of the TCM operation.

6-84

Page 212
Image 212
Samsung S3F80JB manual TCM Test Complement Under Mask, R0,R1 = 0C7H, R1 = 02H, Z =