gc80c520a CORERIVER Semiconductor, gc80c520a Datasheet - Page 124

• Manufacturer Part Number: gc80c520a
• Description: Midas1.0 Family Mask Rom/eprom/romless 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

JZ
Description:
rel
Operation:
Encoding:
Function:
Example:
Cycles:
Bytes:
Jump if Accumulator Zero
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.
The Accumulator originally contains 01h. The instruction sequence,
JZ
DEC A
JZ
will change the Accumulator to 00h and cause program execution to continue at
the instruction identified by the label LABEL2.
2
3
JNZ
(PC)
IF (A) = 0
0
Preliminary
THEN (PC)
←
1
LABEL1
LABEL2
(PC) + 2
1
0
←
0 0 0 0
(PC) + rel
Page 124 of 187
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Instruction Set