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ST10 FAMILY PROGRAMMING MANUAL
CMPB
Syntax
Operation
Data Types
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
E
*
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.
Addressing Modes
Mnemonic
CMPB
CMPB
CMPB
CMPB
CMPB
CMPB
62/172
Integer Compare
CMPB
(op1)
BYTE
Z
*
Rb
, Rb
n
m
Rb
, [Rw
]
n
i
Rb
, [Rw
+]
n
i
Rb
, #data
n
3
reg, #data
16
reg, mem
op1, op2
<--> (op2)
V
*
Format
41 nm
49 n:10ii
49 n:11ii
49 n:0###
47 RR ## ##
43 RR MM MM
C
N
S
*
Bytes
2
2
2
2
4
4
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