Sonic Alert msm80154s, msm83c154s, msm85c154hvs JNC code address Jump if carry is not set, 303

Models: msm83c154s msm85c154hvs msm80154s

1 378
Download 378 pages 26.51 Kb
Page 310
Image 310

DESCRIPTION OF INSTRUCTIONS

47. JNC code address (Jump if carry is not set)

 

 

7

 

 

 

 

 

 

 

 

 

0

 

Instruction code

:

0

 

1

0

1

 

 

0

0

0

0

Byte 1

 

 

7

 

 

 

 

 

 

 

 

 

0

 

Relative offset

 

R7

R6

R5

R4

 

 

R3

R2

R1

R0

Byte 2

Operations

: (PC)(PC)+2

 

 

 

 

 

 

 

 

 

 

IF (C)=0

 

 

 

 

 

 

 

 

 

 

 

THEN

 

 

 

 

 

 

 

 

 

 

 

 

(PC)(PC)+relative offset

 

 

 

 

Number of bytes

: 2

 

 

 

 

 

 

 

 

 

 

 

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 carry flag is 0.

 

 

Control is shifted to the next address following this instruction if

 

 

the content is 1.

 

 

 

 

 

 

 

 

303

Page 310
Image 310
Sonic Alert msm80154s, msm83c154s, msm85c154hvs user manual JNC code address Jump if carry is not set, 303