Sonic Alert msm83c154s, msm80154s, msm85c154hvs user manual 296

Models: msm83c154s msm85c154hvs msm80154s

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MSM80C154S/83C154S/85C154HVS

43. JBC bit address, code address (Jump and clear if bit is set)

 

 

7

 

 

 

 

 

 

 

 

 

 

0

 

Instruction code

:

0

 

0

0

 

1

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

(bit address)0

 

 

 

 

 

 

 

 

 

 

(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, and that bit is cleared to 0.

 

 

Control is shifted to the next address following this instruction if

 

 

the content is 0.

 

 

 

 

 

 

 

 

296

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Sonic Alert msm83c154s, msm80154s, msm85c154hvs user manual 296