Zilog EZ80F916 - Manual (Page 131)

eZ80
®
CPU
User Manual
UM007715-0415 CPU Instruction Set
122
CP A, r
Compare with Accumulator
Operation
A – r
Description
The r operand is any of the 8-bit CPU registers A, B, C, D, E, H, or L. The CPU compares
the r operand to the contents of the accumulator, A, and outputs the difference. The execu-
tion of this instruction does not affect the contents of the accumulator or the r operand.
Condition Bits Affected
Attributes
jj
identifies the A, B, C, D, E, H, or L register and is assembled into one of the opcodes
indicated in Table 50 .
S
Set if result is negative; reset otherwise.
Z
Set if A = r; reset otherwise.
H
Set if borrow from bit 4; reset otherwise.
P/V
Set if overflow: reset otherwise.
N
Set.
C
Set if borrow; reset otherwise.
Mnemonic Operand ADL Mode Cycle Opcode (hex)
CP
A,r X 1
jj