M80C51 データシートの表示（PDF） - Oki Electric Industry
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M80C51 Datasheet PDF : 39 Pages
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¡ Semiconductor
MSM80C31F/80C51F
Instruction Set Details (continued)
Type
Mnemonic
CJNE A, direct,
rel
Instruction code
D7 D6 D5 D4 D3 D2 D1 D0
1011 0101
a7 a6 a5 a4 a3 a2 a1 a0
R7 R6 R5 R4 R3 R2 R1 R0
Bytes Cycles
Description
3 2 (PC) ¨ (PC)+3
IF
(A)π(direct address)
THEN
(PC) ¨ (PC)+relative offset
IF
(A)<(direct address)
THEN
(C) ¨ 1
ELSE
(C) ¨ 0
CJNE A, #data, 1 0 1 1 0 1 0 0 3
rel
I7 I6 I5 I4 I3 I2 I1 I0
R7 R6 R5 R4 R3 R2 R1 R0
2 (PC) ¨ (PC)+3
IF
(A)π #data
THEN
(PC) ¨ (PC)+relative offset
IF
(A)< #data
THEN
(C) ¨ 1
ELSE
(C) ¨ 0
CJNE Rr,
#data, rel
1 0 1 1 1 r2 r1 r0 3
I7 I6 I5 I4 I3 I2 I1 I0
R7 R6 R5 R4 R3 R2 R1 R0
2 (PC) ¨ (PC)+3
IF
((Rr))π #data
THEN
(PC) ¨ (PC)+relative offset
IF
(Rr))< #data
THEN
(C) ¨ 1
ELSE
(C) ¨ 0
CJNE @Rr,
#data, rel
1 0 1 1 0 1 1 r0 3
I7 I6 I5 I4 I3 I2 I1 I0
R7 R6 R5 R4 R3 R2 R1 R0
2 (PC) ¨ (PC)+3
IF
((Rr))π #data
THEN
(PC) ¨ (PC)+relative offset
IF
((Rr))< #data
THEN
(C) ¨ 1
ELSE
(C) ¨ 0
DJNZ Rr, rel 1 1 0 1 1 r2 r1 r0 2
R7 R6 R5 R4 R3 R2 R1 R0
DJNZ direct, 1 1 0 1 0 1 0 1 3
rel
a7 a6 a5 a4 a3 a2 a1 a0
R7 R6 R5 R4 R3 R2 R1 R0
2 (PC) ¨ (PC)+2
(Rr) ¨ (Rr)–1
IF
(Rr)< 0
THEN
(PC) ¨ (PC)+relative offset
2 (PC) ¨ (PC)+3
(direct address) ¨ (direct address)–1
IF
(direct address)π 0
THEN
(PC) ¨ (PC)+relative offset
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