D950CORE View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

D950CORE

16-Bit Fixed Point Digital Signal Processor (DSP) Core

STMicroelectronics 

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

Ai = Lj ASR #value

Rj LSR

Aj ROL

P ASL

*AXm + IXs= AkH

*AYn + IYr= AkH

,

Ai = oper_1 Ai

Note:

value=1...32 for ASR, value=0...32 for ROL,

value=1...32 for LSR and value=0...31 for ASL

VR02018D

45/89

6

Share Link: