LPC47M14X datasheet(63/205 Pages) SMSC

63 / 205 page

SMSC DS – LPC47M14X

Page 63

Rev. 05/02/2000

Table 30 – Interrupt Control Table

FIFO

MODE

ONLY

INTERRUPT

IDENTIFICATION

INTERRUPT SET AND RESET FUNCTIONS

BIT 3

BIT 2 BIT 1 BIT 0

PRIORITY

LEVEL

INTERRUPT

TYPE

INTERRUPT

SOURCE

INTERRUPT

RESET

CONTROL

None

Highest

Receiver Line

Status

Overrun Error,

Parity Error,

Framing Error or

Break Interrupt

Reading the Line

Status Register

Second

Received Data

Available

Receiver Data

Available

Read Receiver

Buffer or the FIFO

drops below the

trigger level.

Second

Character

Timeout

Indication

No Characters

Have Been

Removed From or

Input to the RCVR

FIFO during the

last 4 Char times

and there is at

least 1 char in it

during this time

Reading the

Receiver Buffer

Third

Transmitter

Holding

Transmitter

Holding Register

Empty

Reading the IIR

of Interrupt) or

Writing the

Transmitter

Holding Register

Fourth

MODEM

Status

Clear to Send or

Data Set Ready or

Ring Indicator or

Data Carrier

Detect

Reading the

MODEM Status

LINE CONTROL REGISTER (LCR)

Address Offset = 3H, DLAB = 0, READ/WRITE

Start LSB Data 5-8 bits MSB Parity Stop

Serial Data

This register contains the format information of the serial line. The bit definitions are:

Bits 0 and 1

These two bits specify the number of bits in each transmitted or received serial character. The encoding of bits 0 and 1

is as follows:

The Start, Stop and Parity bits are not included in the word length.

BIT 1

BIT 0 WORD LENGTH

5 Bits

6 Bits

7 Bits

8 Bits

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