Atmel 8051 - Page 32

The 8051 Instruction Set
1-31 Atmel 8051 Microcontrollers Hardware Manual
4316B–8051–02/04
CJNE A,#data,rel
Bytes: 3
Cycles: 2
Encoding: 10110100 immediate data rel. address
Operation: (PC) ← (PC) + 3
IF (A) < > data
THEN
(PC) ← (PC) + relative offset
IF (A) < data
THEN
(C) ← 1
ELSE
(C) ← 0
CJNE R
n
,#data,rel
Bytes: 3
Cycles: 2
Encoding: 1 0 1 1 1 r r r immediate data rel. address
Operation: (PC) ← (PC) + 3
IF (R
n
) < > data
THEN
(PC) ← (PC) + relative offset
IF (R
n
) < data
THEN
(C) ← 1
ELSE
(C) ← 0
CJNE @R
i
,data,rel
Bytes: 3
Cycles: 2
Encoding: 1011011 i immediate data rel. address
Operation: (PC) ← (PC) + 3
IF ((R
i
)) < > data
THEN
(PC) ← (PC) + relative offset
IF ((R
i
)) < data
THEN
(C) ← 1
ELSE
(C) ← 0