Infineon Technologies C166S V2 User Manual page 358

CoMACMu
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 16-bit source operands op1 and op2. The resulting
unsigned 32-bit product is first zero-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. The MAL register is cleared. 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
CoMACMu op1, op2, rnd
op1, op2 → WORD
ACC → 40-bit signed value
ME MSV
* *
Detailed Instruction Description
MC MZ
* *
8-358
User Manual
C166S V2
CoMACMu
MN Sat.
* yes
V 1.7, 2001-01