xr16l2450im Exar Corporation, xr16l2450im Datasheet - Page 12

• Manufacturer Part Number: xr16l2450im
• Description: Industry Smallest Package Uart With 2.25v To 5.5v Operation
• Manufacturer: Exar Corporation

XR16L2450
2.25V TO 5.5V DUART
Each of the UART channel in the L2450 has its own set of configuration registers selected by address lines A0,
A1 and A2 with CSA# or CSB# selecting the channel. The registers are 16C450 compatible. The complete
register set is shown on
3.0 UART INTERNAL REGISTERS
A2,A1,A0 A
0
0
0
0
0
0
0
1
1
1
1
0
0 0
0 1
0 0
0 1
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
DDRESSES
T
ABLE
Table 4
RHR - Receive Holding Register
THR - Transmit Holding Register
DLL - Div Latch Low Byte
DLM - Div Latch High Byte
DREV - Device Revision
DVID - Device ID
IER - Interrupt Enable Register
ISR - Interrupt Status Register
Reserved
LCR - Line Control Register
MCR - Modem Control Register
LSR - Line Status Register
Reserved
MSR - Modem Status Register
Reserved
SPR - Scratch Pad Register
4: UART CHANNEL A AND B UART INTERNAL REGISTERS
and
Table
16C550 C
R
EGISTER
5.
OMPATIBLE
12
R
EGISTERS
R
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read-only
Read-only
Read-only
Read-only
Write-only
Write-only
Write-only
Write-only
EAD
/W
RITE
DLL = 0x00, DLM = 0x00
LCR[7] = 1,
C
LCR[7] = 0
LCR[7] = 1
LCR[7] = 0
xr
OMMENTS
REV. 1.1.1