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DESCRIPTION OF INSTRUCTIONS
243
Mnemonic
Instruction code
D7 D6 D5 D4 D3 D2 D1 D0
Byte Cycle Description Page
Classifi-
cation
Branching instructions
CJNE
DJNZ
DJNZ
JZ
@Rr, #data,
rel
Rr, rel
direct, rel
rel
3
2
3
2
2
2
2
2
(PC)←(PC)+3
IF ((Rr))
≠
#data r=0 or 1
THEN
(PC)←(PC)+relative offset
IF ((Rr))<#data r=0 or 1
THEN
(C)←1
ELSE
(C)←0
(PC)←(PC)+2
(Rr)←(Rr)–1 r=0~7
IF (Rr)
≠
0 r=0~7
THEN
(PC)←(PC)+relative offset
(PC)←(PC)+3
(direct address)←(direct address)–1
IF (direct address)
≠
0
THEN
(PC)←(PC)+relative offset
(PC)←(PC)+2
IF (A)=0
THEN
(PC)←(PC)+relative offset
264
285
287
307
1011011r
R
7 R6 R5 R4 R3 R2 R1 R0
I7 I6 I5 I4 I3 I2 I1 I0
11011r2 r1 r0
R7 R6 R5 R4 R3 R2 R1 R0
11010101
R
7 R6 R5 R4 R3 R2 R1 R0
a7 a6 a5 a4 a3 a2 a1 a0
01100000
R
7 R6 R5 R4 R3 R2 R1 R0