logical 8051
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The document summarizes common logical instructions in computing including bitwise logic operations like AND, OR, XOR, and NOT. It also covers instructions for clearing bits, rotating bits, swapping bits, and rotating through the carry flag. Examples are provided for each type of logical instruction to demonstrate how they work on bits in a processor.
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logical 8051
- 2. Bitwise logic operations (AND, OR, XOR, NOT) Clear Rotate Swap Logic instructions do NOT affect the flags in PSW
- 3. Bitwise Logic ANL AND ORL OR XRL XOR CPL Complement Examples: 00001111 10101100 ANL 00001111 10101100 ORL 00001111 10101100 XRL 10101100 CPL 00001100 10101111 10100011 01010011
- 4. anl PSW, #0xE7 ;PSW AND 11100111 orl PSW, #0x18 ;PSW OR 00011000 xrl P1, #0x40 ;P1 XRL 01000000
- 5. Other Logic Instructions CLR - clear RL – rotate left RLC – rotate left through Carry RR – rotate right RRC – rotate right through Carry SWAP – swap accumulator nibbles
- 6. CLR ( Set all bits to 0 ) CLR A CLR byte (direct mode) CLR Ri (register mode) CLR @Ri (register indirect mode)
- 7. Rotate Rotate instructions operate only on a RL a Mov a,#0xF0 ; a 11110000 RR a ; a 11100001 RR a Mov a,#0xF0 ; a 11110000 RR a ; a 01111000
- 8. Rotate through Carry RRC a mov a, #0A9h ; a A9 add a, #14h ; a BD (10111101), C 0 rrc a ; a 01011110, C 1 RLC a mov a, #3ch ; a 3ch(00111100) setb c ; c 1 rlc a ; a 01111001, C 1 C C
- 9. Swap SWAP a mov a, #72h ; a 27h swap a ; a 27h
- 10. Rotate and Multiplication/Division Note that a shift left is the same as multiplying by 2, shift right is divide by 2 mov a, #3; A 00000011 (3) clr C ; C 0 rlc a ; A 00000110(6) rlc a ; A 0000110(12) rrc a ; A 00000110(6)