xr16l651im Exar Corporation, xr16l651im Datasheet - Page 23

• Manufacturer Part Number: xr16l651im
• Description: 2.25v To 5.5v Uart With 32-byte Fifo
• Manufacturer: Exar Corporation

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REV. 1.3.0
The 651 has a set of configuration registers selected by address lines A0 to A2. The based page registers are
16C550 compatible with EXAR enhanced feature registers located on the second page (mirror) addresses.
The second page registers are only accessible by setting LCR register to a value of 0xBF. The register set is
shown on
3.0 UART CONFIGURATION REGISTERS
A
A2 A1 A0
0
0
0
0
0
0
0
1
1
1
1
0
1
1
1
1
0
DDRESS
0 0
0 1
0 0
0 1
0 1
1 0
1 1
0 0
0 1
1 0
1 1
1 0
0 0
0 1
1 0
1 1
0 0
Table 7
RHR - Receive Holding Register
THR - Transmit Holding Register
DLL - Divisor Latch Low
DLM - Divisor Latch High
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
XFR - Extra Feature Register
MSR - Modem Status Register
IRPW - Infrared Pulse Width Register
SPR - Scratch Pad 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
and
Table
T
ABLE
8.
.
7: XR16L651 UART CONFIGURATION REGISTERS
R
EGISTER
16550 C
E
NHANCED
OMPATIBLE
23
R
EGISTERS
R
EGISTERS
2.25V TO 5.5V UART WITH 32-BYTE FIFO
R
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read-only
Write-only
Read-only
Read-only
Read-only
Write-only
Read-only
Write-only
Read-only
Write-only
EAD
/W
RITE
LCR[7] = 1, LCR
LCR[7] = 1, LCR
LCR[7] = 1, LCR
LCR[7] = 1, LCR
LCR[7] = 0, EFR[4] = 1
LCR[7] = 0, EFR[4] = 1
DLL, DLM = 0x00
DLL, DLM = 0x00
LCR = 0xBF
LCR = 0xBF
LCR = 0xBF
LCR = 0xBF
LCR = 0xBF
C
LCR[7] = 0
LCR[7] = 0
LCR[7] = 0
LCR[7] = 0
LCR[7] = 0
LCR[7] = 0
LCR[7] = 0
OMMENTS
XR16L651
0xBF,
0xBF,
0xBF
0xBF