A <- A - (HL)
The byte at memory address specified by the contents of the HL register pair is compared with the contents of the Accumulator. If there is a true compare, the Z flag is set. The execution of this instruction does not affect the contents of the Accumulator.
|S||is set if result is negative, otherwise it is reset.|
|Z||is set if result is 0, otherwise it is reset.|
|H||is set if borrow from bit 4, otherwise it is reset.|
|P/V||is set if overflow, otherwise it is reset|
|C||is set if borrow, otherwise it is reset.|
If the Accumulator contains $63, register pair HL contains $2323, and memory location $2323 contains byte $60, then upon the execution of
the P/V flag in the F Register is reset.