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ST162552 Fiches technique(PDF) 10 Page - Exar Corporation

No de pièce ST162552
Description  DUAL ASYNCHRONOUS RECEIVER/TRANSMITTER WITH FIFOs
Download  28 Pages
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Fabricant  EXAR [Exar Corporation]
Site Internet  http://www.exar.com
Logo EXAR - Exar Corporation

ST162552 Fiches technique(HTML) 10 Page - Exar Corporation

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ST16C2552
BIT-2
BIT-1
MF* Function
0
0
OP2*
0
1
BAUDOUT*
1
0
RXRDY*
1
1
Reserved
AFR BIT 3-7:
Not used. All these bits are set to logic zero.
LINE CONTROL REGISTER (LCR)
The Line Control Register is used to specify the
asynchronous data communication format. The num-
ber of the word length, stop bits, and parity can be
selected by writing appropriate bits in this register.
LCR BIT1-0:
These two bits specify the word length to be transmit-
ted or received.
BIT-1
BIT-0
Word length
00
5
01
6
10
7
11
8
LCR BIT-2:
The number of stop bits can be specified by this bit.
BIT-2
Word length
Stop bit(s)
0
5,6,7,8
1
1
5
1-1/2
1
6,7,8
2
LCR BIT-3:
Parity or no parity can be selected via this bit.
0=no parity
1=a parity bit is generated during the transmission,
receiver also checks for received parity.
LCR BIT-4:
If the parity bit is enabled, LCR BIT-4 selects the even
or odd parity format.
0=ODD parity is generated by forcing an odd number
of 1’s in the transmitted data, receiver also checks for
same format.
1= EVEN parity bit is generated by forcing an even
number of 1’s in the transmitted data, receiver also
checks for same format.
LCR BIT-5:
If the parity bit is enabled, LCR BIT-5 selects the
forced parity format.
LCR BIT-5=1 and LCR BIT-4=0, parity bit is forced to
“1” in the transmitted and received data.
LCR BIT-5=1 and LCR BIT-4=1, parity bit is forced to
“0” in the transmitted and received data.
LCR BIT-6:
Break control bit. It causes a break condition to be
transmitted (the TX is forced to low state).
0=normal operating condition.
1=forces the transmitter output (TX) to go low to alert
the communication terminal.
LCR BIT-7:
The internal baud rate counter latch enable (DLAB).
0=normal operation.
1=select Divisor Latch Register and Alternate Func-
tion Register.
MODEM CONTROL REGISTER (MCR)
This register controls the interface with the MODEM
or a peripheral device (RS232).
MCR BIT-0:
0=force DTR* output to high.
1=force DTR* output to low.
MCR BIT-1:
0=force RTS* output to high.
1=force RTS* output to low.


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