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ST20-C1 数据表(PDF) 94 Page - STMicroelectronics

部件名 ST20-C1
功能描述  Instruction Set Reference Manual
PDF  205 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST20-C1 数据表(HTML) 94 Page - STMicroelectronics

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®
ashr
arithmetic shift right
Code: 21 FF
Description: Perform an arithmetic shift right of Breg by Areg bits, copying the sign
bit into the vacated bits. Breg, not Areg, is rotated into Creg, to preserve the value
rather than the shift length.
Definition:
Areg
′← (Breg >>
arith Aregunsigned)
Breg
′← Creg
Creg
′← Breg
Status Register:
No effect
Comments:
Secondar y instruction.
If Areg is not in the range 0..31 then the result is undefined.
See also:
shl shr
section 4.9.



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