Siemens C16 Series Instruction Set Manual page 111

SUBC
Syntax
Operation
Data Types
Description
Condition Flags
Addressing Modes
Semiconductor Group
30Mar98@15:00h
Integer Subtraction with Carry
SUBC op1, op2
(op1) ← (op1) - (op2) - (C)
WORD
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
* S
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 and the previous Z flag was set. Cleared other-
wise.
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
SUBC Rw , Rw
n
SUBC Rw , [Rw
n
SUBC Rw , [Rw
n
SUBC Rw , #data3
n
SUBC reg, #data16
SUBC reg, mem
SUBC mem, reg
C166 Family Instruction Set
V C N
* S *
Format
30 nm
m
] 38 n:10ii
i
+] 38 n:11ii
i
38 n:0###
36 RR ## ##
32 RR MM MM
34 RR MM MM
111
Instruction Description
SUBC
Version 1.2, 12.97
Bytes
2
2
2
2
4
4
4