Compare with memory, Electrical Engineering

Compare with memory

The contents  of the memory  of the memory  location  pointed by HL  register pair are compared with the  contents of the accumulator. The  instruction format is

CMP M        (A- [ HL])

The contents  of the both  the operand memory  location  and the  accumulator do not change. The flags  are modified  similar  to subtraction.

Flags : All flags  are modified  but he conclusion can be  made only by CY and  Z flag   as shown  below.

If A> M : CUY and Z flag are reset

IF a = M : Z flag  is set and CY flag is reset.

IF A < M : CY  is set and Z flag is reset.

Posted Date: 4/5/2013 12:51:57 AM | Location : United States







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