Infineon Technologies C166S V2 User Manual page 380

CoMACsu-
Group
Syntax
Source Operand(s)
Destination Operand(s)
Operation
(tmp) ← (op1) * (op2)
(ACC) ← (ACC) - (tmp)
Description
Multiplies the two signed and unsigned 16-bit source operands op1 and op2,
respectively. The resulting signed 32-bit product is first sign-extended and then
subtracted from the 40-bit ACC register contents before being stored in the 40-bit 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
CoMACsu- Rw
CoMACsu- Rw
CoMACsu- [IDXi*] , [Rw
User Manual
Mixed Multiply-Accumulate
Multiply/Multiply-Accumulate Instructions
CoMACsu- op1, op2
op1, op2 → WORD
ACC → 40-bit signed value
ME MSV
* *
, Rw
n m
, [Rw *]
n m
*]
m
Detailed Instruction Description
MC MZ
* *
Format
A3 nm 60 rrr0:0000
83 nm 60 rrr0:0qqq
93 Xm 60 rrr0:0qqq
8-380
User Manual
C166S V2
CoMACsu-
MN Sat.
* yes
Bytes
4
4
4
V 1.7, 2001-01