LPC47M182 datasheet(83/223 Pages) SMSC

83 / 223 page

Advanced I/O Controller with Motherboard GLUE Logic

Datasheet

SMSC LPC47M182

Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)

DATASHEET

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

Bit 2

This bit specifies the number of stop bits in each transmitted or received serial character. The following

table summarizes the information.

BIT 2

WORD LENGTH

NUMBER OF

STOP BITS

5 bits

1.5

6 bits

7 bits

8 bits

Note: The receiver will ignore all stop bits beyond the first, regardless of the number used in transmitting.

Bit 3

Parity Enable bit. When bit 3 is a logic “1”, a parity bit is generated (transmit data) or checked (receive

data) between the last data word bit and the first stop bit of the serial data. (The parity bit is used to

generate an even or odd number of 1s when the data word bits and the parity bit are summed).

Bit 4

Even Parity Select bit. When bit 3 is a logic “1” and bit 4 is a logic “0”, an odd number of logic “1”’s is

transmitted or checked in the data word bits and the parity bit. When bit 3 is a logic “1” and bit 4 is a logic

“1” an even number of bits is transmitted and checked.

Bit 5

This bit is the Stick Parity bit. When parity is enabled it is used in conjunction with bit 4 to select Mark or

Space Parity. When LCR bits 3, 4 and 5 are 1 the Parity bit is transmitted and checked as a 0 (Space

Parity). If bits 3 and 5 are 1 and bit 4 is a 0, then the Parity bit is transmitted and checked as 1 (Mark

Parity). If bit 5 is 0 Stick Parity is disabled.

Bit 6

Set Break Control bit. When bit 6 is a logic “1”, the transmit data output (TXD) is forced to the Spacing or

logic “0” state and remains there (until reset by a low level bit 6) regardless of other transmitter activity.

This feature enables the Serial Port to alert a terminal in a communications system.

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