xr20m1172 Exar Corporation, xr20m1172 Datasheet - Page 24

• Manufacturer Part Number: xr20m1172
• Description: Two Channel I2c/spi Uart With 64-byte Fifo
• Manufacturer: Exar Corporation

XR20M1172
TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO
The complete register set is shown below in
3.0 UART INTERNAL REGISTERS
A
DDRESS
0X00
0X00
0X01
0X02
0X01
0X02
0X03
0X04
0X05
0X06
0X07
0X06
0X07
0X08
0x0C
0x0D
0x09
0x0A
0x0B
0x0E
0x0F
0x02
0x04
0x05
0x06
0x07
RHR - Receive Holding Register
THR - Transmit Holding Register
DLL - Divisor LSB
DLM - Divisor MSB
DLD - Divisor Fractional
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
TCR - Transmission Control Register
TLR - Trigger Level Register
TXLVL - Transmit FIFO Level
RXLVL - Receive FIFO Level
IODir - GPIO Direction Control Register
IOState - GPIO State Register
IOIntEna - GPIO Interrupt Enable Register
Reserved
IOControl - GPIO Control Register
EFCR - Extra Features 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
7: UART INTERNAL REGISTER ADDRESSES
16C550 C
R
EGISTER
Table 7
OMPATIBLE
and
24
Table
R
EGISTERS
8.
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/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Write-only
Write-only
EAD
/W
-
RITE
LCR[7] = 1, LCR ≠ 0xBF,
LCR[7] = 1, LCR ≠ 0xBF
See
See
See
See
LCR = 0xBF
LCR ≠ 0xBF
C
LCR[7] = 0
EFR[4] = 1
LCR[7] = 0
LCR[7] = 0
OMMENTS
Table 12
Table 13
Table 12
Table 13
REV. 1.0.0