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TMS320F Datasheet(PDF) 136 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) 136 Page - Texas Instruments

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APAC
Add PREG to Accumulator
7-36
Syntax
APAC
Operands
None
15
14
13
12
11
10
987
6543
210
1
0
1
1
1
1
1
0
0
0
0
0
0
1
0
0
Execution
Increment PC, then ...
(ACC) + shifted (PREG)
→ ACC
Status Bits
Affected by
Affects
PM and OVM
C and OV
This instruction is not affected by SXM.
Description
The contents of PREG are shifted as defined by the PM status bits of the ST1
register (see Table 7–7) and added to the contents of the accumulator. The re-
sult is placed in the accumulator. APAC is not affected by the SXM bit of the
status register. PREG is always sign extended. The task of the APAC instruc-
tion is also performed as a subtask of the LTA, LTD, MAC, MACD, MPYA, and
SQRA instructions.
Table 7–7. Product Shift Modes
PM Bits
Bit 1
Bit 0
Resulting Shift
0
0
No shift
0
1
Left shift of 1 bit
1
0
Left shift of 4 bits
1
1
Right shift of 6 bits
Words
1
Cycles for a Single APAC Instruction
ROM
DARAM
SARAM
External
1
1
1
1+p
Cycles for a Repeat (RPT) Execution of an APAC Instruction
ROM
DARAM
SARAM
External
n
n
n
n+p
Opcode
Cycles



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