SAB80515 Datasheet, PDF (168/270 Pages) Siemens Semiconductor Group – 8-Bit Single-Chip Microcontroller Family

Instruction Set
JNC
rel
Function:
Jump if carry is not set
Description:
If the carry flag is a zero, branch to the address indicated; otherwise proceed with
the next instruction. The branch destination is computed by adding the signed
relative-displacement in the second instruction byte to the PC, after incrementing
the PC twice to point to the next instruction. The carry flag is not modified.
Example:
The carry flag is set. The instruction sequence
JNC
CPL
JNC
LABEL1
C
LABEL2
will clear the carry and cause program execution to continue at the instruction
identified by the label LABEL2.
Operation:
JNC
(PC) ← (PC) + 2
if (C) = 0
then (PC) ← (PC) + rel
Encoding:
0101 0000
rel. address
Bytes:
2
Cycles:
2
Semiconductor Group
168