Infineon Technologies C166S V2 User Manual page 415

CoSUB2R
Group
Syntax
Source Operand(s)
Destination Operand(s)
Operation
(tmp) ← 2 * (op2) || (op1)
(ACC) ← (tmp) - (ACC)
Description
Subtracts the 40-bit ACC contents from a 40-bit operand and stores the result in the
ACC register. The 40-bit operand is a sign-extended result of the concatenation of the
two source operands op1 (LSW) and op2 (MSW). The 40-bit operand is then multiplied
by two before being subtracted from the ACC register.
MAC Flags
MV MSL
* *
MV Set if an arithmetic underflow occurred, i.e. the result cannot be
represented in the 40-bit data type. Cleared otherwise.
MSL Set if the contents of ACC is automatically saturated. Not affected
otherwise.
ME Set if the MAE is used. Cleared otherwise.
MSV Set if an arithmetic underflow occurred. Not affected otherwise.
MC Set if a borrow is generated. Cleared otherwise.
MZ Set if result equals zero. Cleared otherwise.
MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding
Mnemonic
CoSUB2R Rw
CoSUB2R Rw
CoSUB2R [IDXi*] , [Rw
User Manual
Arithmetic Instructions
CoSUB2R op1, op2
op1, op2 → WORD
ACC → 40-bit signed value
ME MSV
* *
, Rw
n m
, [Rw *]
n m
*]
m
Detailed Instruction Description
Subtract
MC MZ
*
Format
A3 nm 52 rrr0:0000
83 nm 52 rrr0:0qqq
93 Xm 52 rrr0:0qqq
8-415
User Manual
CoSUB2R
MN
* *
V 1.7, 2001-01
C166S V2
Sat.
yes
Bytes
4
4
4