Instruction Reference Manual
35
Description
Compares the data in A with an 8-bit constant n. This compare is accomplished by subtracting n from A. The
result is:
A < n : S=1, C=1, Z=0, L/V=V
A = n : S=0, C=0, Z=1, L/V=V
A > n : S=0, C=0, Z=0, L/V=V
“V” indicates that the overflow flag is set on an arithmetic overflow result. That is, the overflow flag is sig-
nalled when the operands have different signs and the sign of the result is different from the argument you are
subtracting from (A in this case). For example if A contains 0x80 and you're comparing it to 0x01 the over-
flow flag will be set.
This operation does not affect the data in A.
CP
n
Opcode
Instruction
Clocks
Operation
FE
n
CP
n
4 (2,2)
A -
n
Flags
ALTD
I/O
S
Z
L/V
C
F
R
SP
S
D
•
•
V
•
•
Summary of Contents for 2000
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Page 4: ...iv Rabbit 2000 Microprocessor...
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