ST10 FAMILY PROGRAMMING MANUAL
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CMPB
Integer Compare
Syntax
CMPB op1,
op2
Operation
(op1) <-->
(op2)
Data Types
BYTE
Description
The source operand specified by op1 is compared to the source operand specified by op2 by performing
a 2’s complement binary subtraction of op2 from op1. The flags are set according to the rules of subtrac-
tion. The operands remain unchanged
Flag
Addressing Modes
E
Z
V
C
N
*
*
*
S
*
E
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise.
Used to signal the end of a table.
Z
Set if result equals zero. Cleared otherwise.
V
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the specified
data type. Cleared otherwise.
C
Set if a borrow is generated. Cleared otherwise.
N
Set if the most significant bit of the result is set. Cleared otherwise.
Mnemonic
Format
Bytes
CMPB
Rb
n
, Rb
m
41 nm
2
CMPB
Rb
n
, [Rw
i
]
49 n:10ii
2
CMPB
Rb
n
, [Rw
i
+]
49 n:11ii
2
CMPB
Rb
n
, #data
3
49 n:0###
2
CMPB
reg, #data
16
47 RR ## ##
4
CMPB
reg, mem
43 RR MM MM
4
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