原创 ADI DSP基础教程：Blackfin的内核之MSASHIFTER（BF533为例）

BARREL-SHIFTER，看图说话！

Overview：

The shifter performs bitwise shifting for 16-bit, 32-bit or 40-bit inputs and yields 16-bit, 32-bit, or 40-bit outputs.

Functions

Arithmetic Shift:

The Arithmetic Shift instruction shifts a registered number a specified distance and direction while preserving the sign of the original number.

The sign bit value back-fills the left-most bit positions vacated by the arithmetic right shift.

Logical Shift:

The Logical Shift instruction logically shifts a registered number a specified distance and direction.

Logical shifts discard any bits shifted out of the register and backfill vacated bits with zeros.

英文没意思，下一章开始，正式中文加视频讲解，详细说说Blackfin的外设。



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