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JZ
rel
Function:
Jump if accumulator is zero
Description:
If all bits of the accumulator are 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. The accumulator is not modified. No flags are affected.
Example:
The accumulator originally contains 01 H . The instruction sequence
JZ
DEC
JZ
will change the accumulator to 00 H and cause program execution to continue at the
instruction identified by the label LABEL2.
Operation:
JZ
(PC) ← (PC) + 2
if (A) = 0
then (PC) ← (PC) + rel
Encoding:
0 1 1 0
Bytes:
2
Cycles:
2
Semiconductor Group
LABEL1
A
LABEL2
0 0 0 0
rel. address
*
170
Instruction Set
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