z80:Opcodes:CPD

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