Infineon Technologies C166S V2 User Manual page 361

CoMACMu-
Group
Syntax
Source Operand(s)
Destination Operand(s)
Operation
(tmp) ← ((op1))*((op2))
(ACC) ← (ACC) - (tmp)
((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 subtracted from the 40-bit ACC
register contents 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 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
CoMACMu- [IDXi*], [Rw
User Manual
Multiply-Accumulate & Move
Multiply/Multiply-Accumulate Instructions
CoMACMu- op1, op2
op1, op2 → WORD
ACC → 40-bit signed value
ME MSV
* *
*]
m
Detailed Instruction Description
MC MZ
* *
Format
93 Xm 28 rrr0:0qqq
8-361
User Manual
C166S V2
CoMACMu-
MN Sat.
* yes
Bytes
4
V 1.7, 2001-01