Infineon Technologies C166S V2 User Manual page 333

CoMAC-
Group
Syntax
Source Operand(s)
Destination Operand(s)
Operation
IF (MP = 1) THEN
ELSE
END IF
Description
Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed
32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted;
then, it is 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.
User Manual
Multiply-Accumulate
Multiply/Multiply-Accumulate Instructions
CoMAC- op1, op2
op1, op2 → WORD
ACC → 40-bit signed value
(tmp) ← ((op1) * (op2)) <<1
(ACC) ← (ACC) - (tmp)
(tmp) ← (op1) * (op2)
(ACC) ← (ACC) - (tmp)
ME MSV
* *
Detailed Instruction Description
MC MZ
* *
8-333
User Manual
C166S V2
CoMAC-
MN Sat.
* yes
V 1.7, 2001-01