OX16C950 rev B
OXFORD SEMICONDUCTOR LTD.
Write the desired value to ICR (address 1012).
Reading from ICR registers:
Ensure that the last value written to LCR was not 0xBF (see above).
Write 0x00 offset to SPR to select ACR.
Set bit 6 of ACR (ICR read enable) by writing x1xxxxxx2 to address 1012. Ensure that other bits in ACR are not changed.
(Software drivers should keep a copy of the contents of the ACR elsewhere since reading ICR involves overwriting ACR!)
Write the desired offset to SPR (address 1112).
Read the desired value from ICR (address 1012).
Write 0x00 offset to SPR to select ACR.
Clear bit 6 of ACR bye writing x0xxxxxx2 to ICR, thus enabling access to standard registers again.
Data Sheet Revision 1.2
Page 18
OXFORD [ OXFORD SEMICONDUCTOR ]
