1. Boolean Operations
This group of instructions is associated with the single-bit operations of the 8051.
This group allows manipulating the individual bits of bit addressable registers and memory locations as well as the CY flag.
The P, OV, and AC flags cannot be directly altered.
This group includes:
Set, clear, and, or complement, move.
Conditional jumps.
8-Nov-18
Micro 8051

2. Boolean Operations CLR SETB CPL Clear a bit or the CY flag.
CLR P1.1
CLR C
SETB
Set a bit or the CY flag.
SETB A.2
SETB C
CPL
Complement a bit or the CY flag.
CPL 40H ; Complement bit 40 of the bit addressable memory
Micro 8051
8-Nov-18

3. Boolean Operations ORL / ANL MOV OR / AND a bit with the CY flag.
ORL C, 20H ; OR bit 20 of bit addressable memory with the CY flag
ANL C, /34H ; AND complement of bit 34 of bit addressable memory with the CY flag.
MOV
Data transfer between a bit and the CY flag.
MOV C, 3FH ; Copy the bit 3F of the bit addressable memory to CY flag .
MOV P1.2, C ; Copy the CY flag to bit 2 of P1.
8-Nov-18
Micro 8051

4. Boolean Operations JC / JNC JB / JNB JBC
Jump to a relative address if CY is set / cleared.
JB / JNB
Jump to a relative address if a bit is set / cleared.
JB ACC.2, <label>
JBC
Jump to a relative address if a bit is set and clear the bit.
Micro 8051
8-Nov-18

5. Boolean Operations CLR C Clear carry flag 1 1
CLR bit Clear direct bit
SETB C Set carry flag
SETB bit Set direct bit
CPL C Complement carry flag 1 1
CPL bit Complement direct bit 2 1
ANL C, bit AND direct bit to carry flag
ANL C,/bit AND complement of direct bit to carry 2 2
ORL C, bit OR direct bit to carry flag
ORL C,/bit OR complement of direct bit to carry
MOV C, bit Move direct bit to carry flag
MOV bit, C Move carry flag to direct bit
8-Nov-18
Micro 8051