z80:Opcodes:CPD

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Multiple instructions combined into one. CPD does these things in this order:

  1. CP (HL)
  2. DEC HL
  3. DEC BC

Syntax

No operands.

   CPD

Effects

The carry is preserved, N is set and all the other flags are affected as defined. P/V denotes the overflowing of BC, while the Z flag is set if A=(HL) before HL is decreased.

Uses

See CPDR for potential uses.

See Also

BIT,CALL,CP,CPDR,CPI,CPIR,JP,JR