Infineon Technologies C166S V2 User Manual page 362

CoMACMus
Group
Syntax
Source Operand(s)
Destination Operand(s)
Operation
(tmp) ← ((op1)) * ((op2))
(ACC) ← (ACC) + (tmp) + 00 0000 8000h
(MAL) ← 0
((IDXi(-*))) ← ((IDXi))
Description
Multiplies the two unsigned and signed 16-bit source operands op1 and op2,
respectively. The resulting signed 32-bit product is first sign-extended; then, it is added
to the 40-bit ACC register contents. Finally, the result is 2s complement rounded before
being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the
two parallel reads, the data pointed to by IDXi overwrites another data located in
memory (DPRAM). The address of the overwritten data depends on the operation
executed on IDXi.
MAC Flags
MV MSL
* *
MV Set if an arithmetic overflow 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 overflow occurred. Not affected otherwise.
MC Set if a carry 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 & Move & Round
Multiply/Multiply-Accumulate Instructions
CoMACMus op1, op2, rnd
op1, op2 → WORD
ACC → 40-bit signed value
ME MSV
* *
Detailed Instruction Description
MC MZ
* *
8-362
User Manual
C166S V2
CoMACMus
MN Sat.
* yes
V 1.7, 2001-01