CSR

from The Free On-line Dictionary of Computing (8 July 2008)

Control and Status Register
CSR

   <hardware> (CSR) A {register} in most {CPUs} which stores
   additional information about the results of machine
   instructions, e.g. comparisons.  It usually consists of
   several independent flags such as {carry}, {overflow} and
   zero.  The CSR is chiefly used to determine the outcome of
   {conditional branch} instructions or other forms of
   conditional execution.

   (1998-06-26)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

CSR
       Cell misSequenced Ratio (ATM)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

CSR
       Certificate Signing Request (SSL)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

CSR
       Cell Switch Router (Toshiba)