xr16v2750 Exar Corporation, xr16v2750 Datasheet - Page 22

• Manufacturer Part Number: xr16v2750
• Description: High Performance Duart With 64-byte Fifo
• Manufacturer: Exar Corporation

XR16V2750
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
Each of the UART channel in the V2750 has its own set of configuration registers selected by address lines A0,
A1 and A2 with CSA# or CSB# selecting the channel. The complete register set is shown on
Table
3.0 UART INTERNAL REGISTERS
8.
A
A2 A1 A0
DDRESSES
0
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
1
1
1
1
0
0 0
0 1
1 0
0 0
0 1
0 1
1 0
1 1
0 0
0 1
1 0
1 1
1 1
1 1
0 0
0 1
1 0
0 0
0 1
1 0
1 1
0 0
RHR - Receive Holding Register
THR - Transmit Holding Register
DLL - Divisor LSB
DLM - Divisor MSB
DLD - Divisor Fractional
DREV - Device Revision Code
DVID - Device Identification Code
IER - Interrupt Enable Register
ISR - Interrupt Status Register
FCR - FIFO Control Register
LCR - Line Control Register
MCR - Modem Control Register
LSR - Line Status Register
MSR - Modem Status Register
SPR - Scratch Pad Register
FLVL - RX/TX FIFO Level Counter Register
EMSR - Enhanced Mode Select Register
TRG - RX/TX FIFO Trigger Level Register
FC - RX/TX FIFO Level Counter Register
FCTR - Feature Control Register
EFR - Enhanced Function Register
Xon-1 - Xon Character 1
Xon-2 - Xon Character 2
Xoff-1 - Xoff Character 1
Xoff-2 - Xoff Character 2
T
ABLE
16C550 C
R
7: UART I
EGISTER
E
NHANCED
OMPATIBLE
NTERNAL
22
R
EGISTERS
R
EGISTERS
R
EGISTERS
R
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Write-only
Write-only
Write-only
Write-only
EAD
/W
RITE
LCR ≠ 0xBF, FCTR[6] = 0
LCR ≠ 0xBF, FCTR[6] = 1
LCR[7] = 1, LCR ≠ 0xBF,
LCR[7] = 1, LCR ≠ 0xBF
LCR[7] = 1, LCR ≠ 0xBF
DLL, DLM = 0x00,
LCR = 0xBF
LCR ≠ 0xBF
LCR ≠ 0xBF
C
LCR[7] = 0
EFR[4] = 1
LCR[7] = 0
OMMENTS
Table 7
REV. 1.0.3
and