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MICROPROCESSOR INSTRUCTION REFERENCE->CPIR

CPIR  Compare accumulator and memory location addressed by HL and then increment HL and decrement BC.  Repeat until A = (HL) or BC = 0

A - (HL) : HL <- HL + 1 : BC <- BC - 1


Flags
    

S	Set if A < (HL) else cleared
Z	Set if A = (HL) else cleared
H	Set if half carry, else cleared
P/V	Cleared if BC becomes 0, else set
N	Set always
C	Not affected

    

	No of	M	T	usec @
	bytes	cycles	states	2 MHz

BC=0 or A=(HL)	2	4	16	8
BC<>0 & A<>(HL)	2	5	21	10.5