Siemens C16 Series Instruction Set Manual page 110

SUBB
Syntax
Operation
Data Types
Description
Condition Flags
Addressing Modes
Semiconductor Group
30Mar98@15:00h
Integer Subtraction
SUBB op1, op2
(op1) ← (op1) - (op2)
BYTE
Performs a 2's complement binary subtraction of the source operand
specified by op2 from the destination operand specified by op1. The result
is then stored in op1.
E Z
* *
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, ie. the result cannot be repre-
sented 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
SUBB Rb , Rb
n m
SUBB Rb , [Rw
n
SUBB Rb , [Rw
n
SUBB Rb , #data3
n
SUBB reg, #data16
SUBB reg, mem
SUBB mem, reg
C166 Family Instruction Set
V C N
* S *
Format
21 nm
] 29 n:10ii
i
+] 29 n:11ii
i
29 n:0###
27 RR ## xx
23 RR MM MM
25 RR MM MM
110
Instruction Description
SUBB
Version 1.2, 12.97
Bytes
2
2
2
2
4
4
4