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TMS320F Datasheet(PDF) 217 Page - Texas Instruments

Part # TMS320F
Description  CPU and Instruction Set
PDF  389 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMS320F Datasheet(HTML) 217 Page - Texas Instruments

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Multiply and Subtract Previous Product
MPYS
7-117
Assembly Language Instructions
Syntax
MPYS
dma
Direct addressing
MPYS
ind [, ARn]
Indirect addressing
Operands
dma:
7 LSBs of the data-memory address
n:
Value from 0 to 7 designating the next auxiliary register
ind:
Select one of the following seven options:
*
*+
*–
*0+
*0–
*BR0+
*BR0–
MPYS
dma
15
14
13
12
11
10
987
6543
210
0
1
0
1
0
0
0
1
0
dma
MPYS
ind [, ARn]
15
14
13
12
11
10
987
6543
210
0
1
0
1
0
0
0
1
1
ARU
N
NAR
Note:
ARU, N, and NAR are defined in section 6.3,
Indirect Addressing Mode (page 6-9).
Execution
Increment PC, then ...
(ACC) – shifted (PREG)
→ ACC
(TREG)
× (data-memory address) → PREG
Status Bits
Affected by
Affects
PM and OVM
C and OV
Description
The contents of TREG are multiplied by the contents of the addressed data
memory location. The result is placed in the product register (PREG). The pre-
vious product, shifted as defined by the PM status bits, is also subtracted from
the accumulator, and the result is placed in the accumulator.
Words
1
Cycles for a Single MPYS Instruction
Program
Operand
ROM
DARAM
SARAM
External
DARAM
1
1
1
1+p
SARAM
1
1
1, 2†
1+p
External
1+d
1+d
1+d
2+d+p
† If the operand and the code are in the same SARAM block
Opcode
Cycles



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