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D950-CORE Fiches technique(PDF) 45 Page - STMicroelectronics

No de pièce D950-CORE
Description  16-Bit Fixed Point Digital Signal Processor DSP Core
PDF  89 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

D950-CORE Fiches technique(HTML) 45 Page - STMicroelectronics

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D950-Core
5.4.2 ALU Instructions
One-word Operand (oper_1)
CLR
Clear Accumulator (AiE:AiH:AiL = 0)
CLRH
Clear 24 MSBs of Accumulator (AiE:AiH = 0)
CLRL
Clear 16 LSBs of Accumulator (AiL = 0)
CLRE
Clear 8 Extension bits of Accumulator (AiE = 0)
SET
Set Accumulator (AiE:AiH:AiL = 0xFF FFFF FFFF)
SETH
Set 24 MSBs of Accumulator (AiE:AiH = 0xFF FFFF)
SETL
Set 16 LSBs of Accumulator (AiL = 0xFFFF)
SEXT
Accumulator is sign extended (AiE loaded with 8 times the MSB of AiH:AiL)
ROUND
Rounds the 40-bit accumulator value
Figure 5.5
ALU One-word Operand
Note:
value=1...32 for ASR, value=0...32 for ROL,
value=1...32 for LSR and value=0...31 for ASL
*AXm + IXs= AkH
*AYn + IYr= AkH
Ai = Lj ASR #value
Rj LSR
Aj ROL
P ASL
,
Ai = oper_1 Ai
VR02018D
6



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