Siemens C16 Series Instruction Set Manual page 112

SUBCB
Syntax
Operation
Data Types
Description
Condition Flags
Addressing Modes
Semiconductor Group
30Mar98@15:00h
Integer Subtraction with Carry
SUBCB op1, op2
(op1) ← (op1) - (op2) - (C)
BYTE
Performs a 2's complement binary subtraction of the source operand
specified by op2 and the previously generated carry bit from the destina-
tion operand specified by op1. The result is then stored in op1. This
instruction can be used to perform multiple precision arithmetic.
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
SUBCB Rb , Rb
n m
SUBCB Rb , [Rw
n
SUBCB Rb , [Rw
n
SUBCB Rb , #data3
n
SUBCB reg, #data16
SUBCB reg, mem
SUBCB mem, reg
C166 Family Instruction Set
V C N
* S *
Format
31 nm
] 39 n:10ii
i
+] 39 n:11ii
i
39 n:0###
37 RR ## xx
33 RR MM MM
35 RR MM MM
112
Instruction Description
SUBCB
Version 1.2, 12.97
Bytes
2
2
2
2
4
4
4