SAB80C517-M16 SIEMENS [Siemens Semiconductor Group], SAB80C517-M16 Datasheet - Page 208

• Manufacturer Part Number: SAB80C517-M16
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

JNB
Function:
Description:
Example:
Operation:
Encoding:
Bytes:
Cycles:
Semiconductor Group
bit,rel
Jump if bit is not set
If the indicated bit is a zero, branch to the indicated address; otherwise proceed with
the next instruction. The branch destination is computed by adding the signed
relative-displacement in the third instruction byte to the PC, after incrementing the
PC to the first byte of the next instruction. The bit tested is not modified. No flags
are affected.
The data present at input port 1 is 11001010 B . The accumulator holds 56 H
(01010110 B ). The instruction sequence
JNB
JNB
will cause program execution to continue at the instruction at label LABEL2.
JNB
(PC)
if (bit) = 0
then (PC)
3
2
0 0 1 1
(PC) + 3
P1.3,LABEL1
ACC.3,LABEL2
0 0 0 0
(PC) + rel.
209
bit address
rel. address
Instruction Set