CP

This is an article about the GB-Z80 CPU.

Opcodes:

Arithmetic and logical: ADD - ADD (16-bit) including LD HL,SP+nn - ADC - AND - CP - CPL - DAA - DEC - DEC and INC (16-bit) - INC - SBC - SUB - OR - XOR
Conditional: CALL - JP - JR - RET
Load: LD (8-bit) - LD (16-bit)
Extended Set: BIT - RES - RL - RLC - RR - RRC - SET - SLA - SRA - SRL - SWAP

The flags are updated as if a SUB instruction had been carried out. The only difference is that the Accumulator is not modified by this instruction.

Instructions

CP B    - $B8 - 1 Machine Cycle
CP C    - $B9 - 1 Machine Cycle
CP D    - $BA - 1 Machine Cycle
CP E    - $BB - 1 Machine Cycle
CP H    - $BC - 1 Machine Cycle
CP L    - $BD - 1 Machine Cycle
CP (HL) - $BE - 2 Machine Cycles
CP A    - $BF - 1 Machine Cycle
CP $NN  - $FE - 2 Machine Cycles

Flags

Z: 1 if result is zero; 0 otherwise
N: 1
H: 1 if borrow from bit 4; 0 otherwise
C: 1 if borrow; 0 otherwise