Infineon Technologies C166S V2 User Manual page 308

SUBB
Group
Syntax
Source Operand(s)
Destination Operand(s)
Operation
(op1) ← (op1) - (op2)
Description
Performs a 2s complement binary subtraction of the source operand specified by op2
and the destination operand specified by op1. The result is then stored in op1.
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 word 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
SUBB Rb
SUBB Rb
SUBB Rb
SUBB Rb
SUBB mem , reg
SUBB reg , #data8
SUBB reg , mem
User Manual
Integer Subtraction
Arithmetic Instructions
SUBB op1, op2
op1, op2 → BYTE
op1 → BYTE
E Z
* *
, #data3
n
, Rb
n m
, [Rw +]
n i
, [Rw ]
n i
Detailed Instruction Description
V C
* S
Format
29 n:0###
21 nm
29 n:11ii
29 n:10ii
25 RR MM MM
27 RR ## xx
23 RR MM MM
8-308
User Manual
C166S V2
SUBB
N
*
Bytes
2
2
2
2
4
4
4
V 1.7, 2001-01