Logical instruction of 8051

Logical Instruction Of 8051 Micro-Controller

Logic instructions perform logic operations upon corresponding bits of two registers. After execution, the result is stored in the first operand.

ANL A,Rn - AND register to the accumulator
A: accumulator
 Rn: any R register (R0-R7)
Description: Instruction performs logic AND operation between the accumulator and Rn register. The result is stored in the accumulator.

EXAMPLE:

Before execution: A= C3h (11000011 Bin.)
R5= 55h (01010101 Bin.)
After execution: A= 41h (01000001 Bin.)

ANL A,direct - AND direct byte to the accumulator
A: accumulator
 Direct: arbitrary register with address 0 - 255 (0 - FFh)
Description: Instruction performs logic AND operation between the accumulator and drect register. As it is direct addressing, the register can be any SFRs or general-purpose register with address 0-7Fh (o-127 dec.). The result is stored in the accumulator.

EXAMPLE:

Before execution: A= C3h (11000011 Bin.)
MASK= 55h (01010101 Bin.)
After execution: A= 41h (01000001 Bin.)

ANL A,@Ri - AND indirect RAM to the accumulator
A: accumulator
 Ri: Register R0 or R1
Description: Instruction performs logic AND operation between the accumulator and register. As it is indirect addressing, the register address is stored in the Ri register (R0 or R1). The result is stored in the accumulator.

EXAMPLE:

Register address SUM = 4Fh R0=4Fh
Before execution: A= C3h (11000011 Bin.)
R0= 55h (01010101 Bin.)
After execution: A= 41h (01000001 Bin.)

ANL A,#data - AND immediate data to the accumulator
A: accumulator
 Data: constant in the range of 0-255 (0-FFh)
Description: Instruction performs logic AND operation between the accumulator and data. The result is stored in the accumulator.

EXAMPLE:

Before execution: A= C3h (11000011 Bin.)
After execution: A= 41h (01000001 Bin.)

ANL direct,A - AND accumulator to direct byte
Direct: arbitrary register with address 0-255 (0-FFh)
 A: accumulator
Description: Instruction performs logic AND operation between direct byte and accumulator. As it is direct addressing, the register can be any SFRs or general-purpose register with address 0-7Fh (0-127 dec.). The result is stored in the direct byte.

EXAMPLE:

Before execution: A= C3h (11000011 Bin.)
MASK= 55h (01010101 Bin.)
After execution: MASK= 41h (01000001 Bin.)

ANL direct,#data - AND immediate data to direct byte
Direct: Arbitrary register with address 0 - 255 (0 - FFh)
 Data: constant in the range between 0-255 (0-FFh)
Description: Instruction performs logic AND operation between direct byte and data. As it is direct addressing, the register can be any SFRs or general-purpose register with address 0-7Fh (0-127 dec.). The result is stored in the direct byte.

EXAMPLE:

Before execution: X= C3h (11000011 Bin.) MASK= 55h (01010101 Bin.) After execution: MASK= 41h (01000001 Bin.)

ANL C,bit - AND direct bit to the carry flag
C: Carry flag
EXAMPLE:


Before execution: ACC= 43h (01000011 Bin.)
C=1
After execution: ACC= 43h (01000011 Bin.)
C=0


ANL C,/bit - AND complements of direct bit to the carry flag
C: carry flag
 Bit: any bit of RAM
Description: Instruction performs logic AND operation between inverted addressed bit and the carry flag. The result is stored in the carry flag.

EXAMPLE:

Before execution: ACC= 43h (01000011 Bin.)
C=1
After execution: ACC= 43h (01000011 Bin.)
C=1

ORL A,Rn - OR register to the accumulator
Rn: any R register (R0-R7)
 A: accumulator
Description: Instruction performs logic OR operation between the accumulator and Rn register. The result is stored in the accumulator.

EXAMPLE:

Before execution: A= C3h (11000011 Bin.)
R5= 55h (01010101 Bin.)
After execution: A= D7h (11010111 Bin.)

ORL A,@Ri - OR indirect RAM to the accumulator
Ri: register R0 or R1
 A: accumulator
Description: Instruction performs logic OR operation between the accumulator and a register. As it is indirect addressing, the register address is stored in the Ri register (R0 or R1). The result is stored in the accumulator.
d;
EXAMPLE:

Register address: TEMP=FAh
Before execution: R1=FAh
TEMP= C2h (11000010 Bin.)
A= 54h (01010100 Bin.)
After execution: A= D6h (11010110 Bin.)

ORL A,direct - OR direct byte to the accumulator
Direct: arbitrary register with address 0-255 (0-FFh)
 A: accumulator
Description: Instruction performs logic OR operation between the accumulator and a register. As it is direct addressing, the register can be any SFRs or general-purpose register with address 0-7Fh (0-127 dec.). The result is stored in the accumulator.

EXAMPLE:

Before execution: A= C2h (11000010 Bin.)
LOG= 54h (01010100 Bin.)
After execution: A= D6h (11010110 Bin.)

ORL direct,A - OR accumulator to the direct byte
Direct: arbitrary register with address 0-255 (0-FFh)
 A: accumulator
Description: Instruction performs logic OR operation between a register and accumulator. As it is direct addressing, the register can be any SFRs or general- purpose register with address 0-7Fh (0-127 dec.). The result is stored in the register.

EXAMPLE:

Before execution: TEMP= C2h (11000010 Bin.)
A= 54h (01010100 Bin.)
After execution: A= D6h (11010110 Bin.)

ORL A,#data - OR immediate data to the accumulator
Data: constant in the range of 0-255 (0-FFh)
 A: accumulator
Description: Instruction performs logic OR operation between the accumulator and the immediate data. The result is stored in the accumulator.

EXAMPLE:

Before execution: A= C2h (11000010 Bin.)
After execution: A= C3h (11000011 Bin.)

ORL C,bit - OR direct bit to the carry flag
C: Carry flag
 Bit: any bit of RAM
Description: Instruction performs logic OR operation between the direct bit and the carry flag. The result is stored in the carry flag.

EXAMPLE:

Before execution: ACC= C6h (11001010 Bin.)
C=0
After execution: C=1

ORL direct,#data - OR immediate data to direct byte
Direct: arbitrary register with address 0-255 (0-FFh)
 Data: constant in the range of 0-255 (0-FFh)
Description: Instruction performs logic OR operation between the immediate data and the direct byte. As it is direct addressing, the direct byte can be any SFRs or general-purpose register with address 0-7Fh (0-127 dec.). The result is stored in the direct byte.

EXAMPLE:

Before execution: TEMP= C2h (11000010 Bin.)
After execution: A= D2h (11010010 Bin.)


XRL A,Rn - Exclusive OR register to accumulator
Rn: any R register (R0-R7)
 A: accumulator
Description: Instruction performs exclusive OR operation between the accumulator and the Rn register. The result is stored in the accumulator.

EXAMPLE:

Before execution: A= C3h (11000011 Bin.)
R3= 55h (01010101 Bin.)
After execution: A= 96h (10010110 Bin.)

Register address: SUM=E3
Before execution: R0=E3 SUM=29h A=A8h,
After execution: A=A9h, SUM=28h

XRL A,@Ri - Exclusive OR indirect RAM to the accumulator
Ri: Register R0 or R1
 A: accumulator
Description: Instruction performs exclusive OR operation between the accumulator and the indirectly addressed register. As it is indirect addressing, the register address is stored in the Ri register (R0 or R1). The result is stored in the accumulator.

EXAMPLE:

Register address: TEMP=FAh, R1=FAh
Before execution: TEMP= C2h (11000010 Bin.)
A= 54h (01010100 Bin.)
After execution: A= 96h (10010110 Bin.)

XRL A,direct - Exclusive OR direct byte to the accumulator
Direct: Arbitrary register with address 0-255 (0-FFh)
 A: accumulator
Description: Instruction performs exclusive OR operation between the accumulator and the direct byte. As it is direct addressing, the register can be any SFRs or general-purpose register with address 0-7Fh (0-127 dec.). The result is stored in the accumulator.

EXAMPLE:

Before execution: A= C2h (11000010 Bin.)
LOG= 54h (01010100 Bin.)
After execution: A= 96h (10010110 Bin.)

XRL direct,A - Exclusive OR accumulator to the direct byte
Direct: arbitrary register with address 0-255 (0-FFh)
 A: accumulator
Description: Instruction performs exclusive OR operation between the direct byte and the accumulator. As it is direct addressing, the register can be any SFRs or general-purpose register with address 0-7Fh (0-127 dec.). The result is stored in the register.

EXAMPLE:

Before execution: TEMP= C2h (11000010 Bin.)
A= 54h (01010100 Bin.)
After execution: A= 96h (10010110 Bin.)

XRL A,#data - Exclusive OR immediate data to the accumulator
Data: constant in the range of 0-255 (0-FFh)
 A: accumulator
Description: Instruction performs exclusive OR operation between the accumulator and the immediate data. The result is stored in the accumulator.

EXAMPLE:

Before execution: A= C2h (11000010 Bin.)
X= 11h (00010001 Bin.)
After execution: A= D3h (11010011 Bin.)

XRL direct,#data - Exclusive OR immediate data to direct byte
Direct: arbitrary register with address 0-255 (0-FFh)
 Data: constant in the range of 0-255 (0-FFh)
Description: Instruction performs exclusive OR operation between the immediate data and the direct byte. As it is direct addressing, the register can be any SFRs or general-purpose register with address 0-7Fh (0-127 dec.). The result is stored in the register.

EXAMPLE:

Before execution: TEMP= C2h (11000010 Bin.)
X=12h (00010010 Bin.)
After execution: A= D0h (11010000 Bin.)

CLR A - Clears the accumulator
A: accumulator
Description: Instruction clears the accumulator.

EXAMPLE:

After execution: A=0

CPL A - Complements the accumulator
A: accumulator
Description: Instruction complements all the bits in the accumulator (1==>0, 0==>1).

EXAMPLE:

Before execution: A= (00110110)
After execution: A= (11001001)

RL A - Rotates the accumulator one bit left
A: accumulator
Description: Eight bits in the accumulator are rotated one bit left, so that the bit 7 is rotated into the bit 0 position.

EXAMPLE:

Before execution: A= C2h (11000010 Bin.)
After execution: A=85h (10000101 Bin.)


RR A - Rotates the accumulator one bit right
A: accumulator
Description: All eight bits in the accumulator are rotated one bit right so that the bit 0 is rotated into the bit 7 position.

EXAMPLE:

Before execution: A= C2h (11000010 Bin.)
After execution: A= 61h (01100001 Bin.)

RLC A - Rotates the accumulator one bit left through the carry flag
A: accumulator
Description: All eight bits in the accumulator and carry flag are rotated one bit left. After this operation, the bit 7 is rotated into the carry flag position and the carry flag is rotated into the bit 0 position.

EXAMPLE:

Before execution: A= C2h (11000010 Bin.)
C=0
After execution: A= 85h (10000100 Bin.)
C=1


RRC A - Rotates the accumulator one bit right through the carry flag
A: accumulator
Description: All eight bits in the accumulator and carry flag are rotated one bit right. After this operation, the carry flag is rotated into the bit 7 position and the bit 0 is rotated into the carry flag position.

EXAMPLE:

Before execution: A= C2h (11000010 Bin.)
C=0
After execution: A= 61h (01100001 Bin.)
C=0

 SWAP A - Swaps nibbles within the accumulator
A: accumulator
Description: A nibble refers to a group of 4 bits within one register (bit0-bit3 and bit4-bit7). This instruction interchanges high and low nibbles of the accumulator.

EXAMPLE:


Before execution: A=E1h (11100001)bin.
After execution: A=1Eh (00011110)bin.

Next Post: Arithmetic Instruction
 
Related Topics:

-> Instruction set of 8051 microcontroller
-> I/O PROGRAMMING OF 8051
-> Reset & Oscillator Circuit of 8051 Micro-Controller
-> Program Status Word-(PSW) of 8051
-> Internal RAM structure of 8051 comtroller