LSI Logic Confidential
SIO Register Descriptions
15-89
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
SP
Stick Parity
29
1 = When in the stick parity mode (SP = high and PEN
= high), change the parity bit transmitted to the inverse of
the EPS bit programmed in the Line Control Register.
EPS
Even Parity Select
28
1 = The total number of 1’s in the transmitted data bits
plus the parity bit is even.
0 = The total number of 1’s in the transmitted data bits
plus the parity bit is odd.
PEN
Parity Enable
27
1 = Enable the generation and transmission of parity bit
in the transmitter and receiver, and the checking of parity
bits in the receiver block of the UART.
STB
Stop Bits
26
This bit, along with WLS[1:0], sets the number of bits to
be transmitted/received per character, and the number of
stop bits to be transmitted per character. The receiver
checks for the first stop bit only. Details are shown in
.
WLS[1:0]
Word Length Select
25:24
These bits, along with STB, set the number of bits to be
transmitted/received per character, and the number of
Table 15.13 Character Length and Stop Bits of LCR
WLS1
WLS0
STB
CharLen
gth
Stop Bits
0
0
0
5 Bits
1
0
1
0
6 Bits
1
1
0
0
7 Bits
1
1
1
0
8 Bits
1
0
0
1
5 Bits
1.5
0
1
1
6 Bits
2
1
0
1
7 Bits
2
1
1
1
8 Bits
2
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