MSM80C154S/83C154S/85C154HVS

42. JB bit address, code address (Jump if bit is set)

 

 

7

 

 

 

 

 

 

 

 

 

 

0

 

Instruction code

:

0

 

0

1

 

0

 

 

0

0

0

0

Byte 1

 

 

7

 

 

 

 

 

 

 

 

 

 

0

 

Bit address

 

b7

b6

b5

b4

 

 

b3

b2

b1

b0

Byte 2

 

 

7

 

 

 

 

 

 

 

 

 

 

0

 

Relative offset

 

R7

R6

R5

R4

 

 

R3

R2

R1

R0

Byte 3

Operations

: (PC)(PC)+3

 

 

 

 

 

 

 

 

 

 

IF (bit address)=1

 

 

 

 

 

 

 

 

 

 

THEN

 

 

 

 

 

 

 

 

 

 

 

 

 

(PC)(PC)+relative offset

 

 

 

 

Number of bytes

: 3

 

 

 

 

 

 

 

 

 

 

 

 

Number of cycles

: 2

 

 

 

 

 

 

 

 

 

 

 

 

Flags

:

C

AC

F0

RS1

 

 

RS0

OV

F1

P

 

(PSW)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

: Control is shifted to a relative jump address if the specified bit

 

 

address content is 1.

 

 

 

 

 

 

 

 

 

Control is shifted to the next address following this instruction if

 

 

the content is 0.

 

 

 

 

 

 

 

 

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