IRCC datasheet(51/79 Pages) SMSC

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Table 31 - Register Summary For An Individual UART Channel

ADDRESS*

SYMBOL

BIT 0

BIT 1

ADDR = 0

DLAB = 0

Receive Buffer Register (Read Only)

RBR

Data Bit 0

(Note 1)

Data Bit 1

ADDR = 0

DLAB = 0

Transmitter Holding Register (Write

Only)

THR

Data Bit 0

Data Bit 1

ADDR = 1

DLAB = 0

Interrupt Enable Register

IER

Enable

Received

Data

Available

Interrupt

(ERDAI)

Enable

Transmitter

Holding

Empty

Interrupt

(ETHREI)

ADDR = 2

Interrupt Ident. Register (Read Only)

IIR

"0" if Interrupt

Pending

Interrupt

Bit

ADDR = 2

FIFO Control Register (Write Only)

FCR

FIFO Enable

RCVR FIFO

Reset

ADDR = 3

Line Control Register

LCR

Word Length

Select Bit 0

(WLS0)

Word Length

Select Bit 1

(WLS1)

ADDR = 4

MODEM Control Register

MCR

Data

Terminal

Ready (DTR)

Request to

Send (RTS)

ADDR = 5

Line Status Register

LSR

Data Ready

(DR)

Overrun Error

(OE)

ADDR = 6

MODEM Status Register

MSR

Delta Clear to

Send (DCTS)

Delta Data

Set Ready

(DDSR)

ADDR = 7

Scratch Register (Note 4)

SCR

Bit 0

Bit 1

ADDR = 0

DLAB = 1

Divisor Latch (LS)

DDL

Bit 0

Bit 1

ADDR = 1

DLAB = 1

Divisor Latch (MS)

DLM

Bit 8

Bit 9

*DLAB is Bit 7 of the Line Control Register (ADDR = 3).

Note 1: Bit 0 is the least significant bit. It is the first bit serially transmitted or received.

Note 2: When operating in the XT mode, this bit will be set any time that the transmitter shift register is empty.

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