Infineon Technologies C166S V2 User Manual page 237

CMPB
Group
Syntax
Source Operand(s)
Destination Operand(s)
Operation
(op1) ⇔ (op2)
Description
The source operand specified by op1 is compared to the source operand specified by
op2 by performing a 2s complement binary subtraction of op2 from op1. The flags are
set according to the rules of subtraction. The operands remain unchanged.
CPU Flags
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 byte 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.
Encoding
Mnemonic
CMPB Rb
CMPB Rb
CMPB Rb
CMPB Rb
CMPB reg , #data8
CMPB reg , mem
User Manual
Integer Compare
Boolean Bit Manipulation Instructions
CMPB op1, op2
op1, op2 → BYTE
none
E Z
* *
, #data3
n
, Rb
n m
, [Rw +]
n i
, [Rw ]
n i
Detailed Instruction Description
V C
* S
Format
49 n:0###
41 nm
49 n:11ii
49 n:10ii
47 RR ## xx
43 RR MM MM
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User Manual
C166S V2
CMPB
N
*
Bytes
2
2
2
2
4
4
V 1.7, 2001-01