OX16PCI952-TQAG OXFORD [Oxford Semiconductor], OX16PCI952-TQAG Datasheet - Page 34

• Manufacturer Part Number: OX16PCI952-TQAG
• Description: Integrated High Performance Dual UARTs, Parallel Port and 5.0v PCI interface
• Manufacturer: OXFORD [Oxford Semiconductor]

OX16PCI952
OXFORD SEMICONDUCTOR LTD.
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 x1xxxxxxb to address 101b. 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 111b).
Read the desired value from ICR (address 101b).
Write 0x00 offset to SPR to select ACR.
Clear bit 6 of ACR bye writing x0xxxxxxb to ICR, thus enabling access to standard registers again.
DS-0028 Jul 05
External-Free Release
Page 34