XR16M598 Datasheet, PDF (31/58 Pages) Exar Corporation – 1.62V TO 3.63V HIGH PERFORMANCE OCTAL UART WITH 16-BYTE FIFO

XR16M598
REV. 1.0.0
1.62V TO 3.63V HIGH PERFORMANCE OCTAL UART WITH 16-BYTE FIFO
3.2 UART Channel Configuration Registers
The first 8 registers are 16550 compatible with EXAR enhanced feature registers located on the upper 8
addresses. The 8 sets of UART configuration registers are decoded using address lines A0 to A3 as shown
below.
TABLE 12: UART CHANNEL CONFIGURATION REGISTERS
ADDRESS
REGISTER
READ/WRITE
COMMENTS
A3 A2 A1 A0
16550 COMPATIBLE
0 0 0 0 RHR - Receive Holding Reg
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 Reg
Read/Write
LCR[7] = 0
0 0 1 0 ISR - Interrupt Status Reg
FCR - FIFO Control Reg
Read-only
Write-only
LCR[7] = 0
0 0 1 1 LCR - Line Control Reg
Read/Write
0 1 0 0 MCR - Modem Control Reg
Read/Write
0 1 0 1 LSR - Line Status Reg
Read-only
0 1 1 0 MSR - Modem Status Reg
- Auto RS485 Delay
Read-only
Write-only
0 1 1 1 SPR - Scratch Pad Reg
Read/Write
ENHANCED REGISTER
1 0 0 0 FCTR
Read/Write
1 0 0 1 EFR - Enhanced Function Reg
Read/Write
1 0 1 0 Reserved
Read-only
1 0 1 1 Reserved
Read-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
Reserved
Write-only
Read-only
1 1 1 0 Xon-1 - Xon Character 1
Reserved
Write-only
Read-only
1 1 1 1 Xon-2 - Xon Character 2
Reserved
Write-only
Read-only
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