XR17V258_08 Datasheet, PDF (37/70 Pages) Exar Corporation – 66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT

REV. 1.0.1
XR17V258
66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT
TABLE 13: UART CHANNEL CONFIGURATION REGISTERS.
ADDRESS
REGISTER
READ/WRITE
COMMENTS
A3 A2 A1 A0
16550 COMPATIBLE
0 0 0 0 RHR - Receive Holding Register
THR - Transmit Holding Register
Read-only
Write-only
LCR[7] = 0
0 0 0 0 DLL - Divisor LSB
Read/Write
LCR[7] = 1
0 0 0 1 DLM - Divisor MSB
Read/Write
LCR[7] = 1
0 0 1 0 DLD - Divisor Fractional Part
Read/Write
LCR[7] = 1
0 0 0 1 IER - Interrupt Enable Register
Read/Write
LCR[7] = 0
0 0 1 0 ISR - Interrupt Status Register
FCR - FIFO Control Register
Read-only
Write-only
LCR[7] = 0
0 0 1 1 LCR - Line Control Register
Read/Write
0 1 0 0 MCR - Modem Control Register
Read/Write
0 1 0 1 LSR - Line Status Register
Read-only
0 1 1 0 MSR - Modem Status Register
- Auto RS485 Delay
Read-only
Write-only
0 1 1 1 SPR - Scratch Pad Register
Read/Write
ENHANCED REGISTER
1 0 0 0 FCTR
Read/Write
1 0 0 1 EFR - Enhanced Function Register
Read/Write
1 0 1 0 TXCNT - Transmit FIFO Level Counter
TXTRG - Transmit FIFO Trigger Level
Read-only
Write-only
1 0 1 1 RXCNT - Receive FIFO Level Counter
RXTRG - Receive FIFO Trigger Level
Read-only
Write-only
1 1 0 0 Xoff-1 - Xoff Character 1
Xchar
Write-only
Read-only
Xon,Xoff Rcvd.
Flags
1 1 0 1 Xoff-2 - Xoff Character 2
Write-only
1 1 1 0 Xon-1 - Xon Character 1
Write-only
1 1 1 1 Xon-2 - Xon Character 2
Write-only
37