Rainbow Electronics W90N745CDG - Manual (Page 274)

W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
- 269 - Revision A2
BITS DESCRIPTIONS
[7] DLAB
Divider Latch Access Bit
0 = It is used to access RBR, THR or IER.
1 = It is used to access Divisor Latch Registers {DLL, DLM}
[6] BCB
Break Control Bit
When this bit is set to logic 1, the serial data output (SOUT) is forced to the Spacing
State (logic 0). This bit acts only on SOUT and has no effect on the transmitter logic.
[5] SPE
Stick Parity Enable
0 = Disable stick parity
1 = Parity bit is transmitted and checked as a logic 1 if bit 4 is 0 (odd parity), or as
a logic 0 if bit 4 is 1 (even parity). This bit has effect only when bit 3 (parity bit
enable) is set.
[4] EPE
Even Parity Enable
0 = Odd number of logic 1’s are transmitted or checked in the data word and
parity bits.
1 = Even number of logic 1’s are transmitted or checked in the data word and
parity bits.
This bit has effect only when bit 3 (parity bit enable) is set.
[3] PBE
Parity Bit Enable
0 = Parity bit is not generated (transmit data) or checked (receive data) during
transfer.
1 = Parity bit is generated or checked between the "last data word bit" and "stop bit"
of the serial data.
[2] NSB
Number of “STOP bit”
0= One “ STOP bit” is generated in the transmitted data
1= One and a half “ STOP bit” is generated in the transmitted data when 5-bit word
length is selected;
Two “ STOP bit” is generated when 6-, 7- and 8-bit word length is selected.
[1:0] WLS
Word Length Select
WLS[1:0] Character length
00 5 bits
01 6 bits
10 7 bits
11 8 bits