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SC16IS740 Datasheet(PDF) 24 Page - NXP Semiconductors

Part # SC16IS740
Description  Single UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

SC16IS740 Datasheet(HTML) 24 Page - NXP Semiconductors

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SC16IS740_750_760
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 7 — 9 June 2011
24 of 63
NXP Semiconductors
SC16IS740/750/760
Single UART with I2C-bus/SPI interface, 64-byte FIFOs, IrDA SIR
[1]
FIFO reset requires at least two XTAL1 clocks, therefore, they cannot be reset without the presence of the
XTAL1 clock.
8.4 Line Control Register (LCR)
This register controls the data communication format. The word length, number of stop
bits, and parity type are selected by writing the appropriate bits to the LCR. Table 12
shows the Line Control Register bit settings.
Table 12.
Line Control Register bits description
Bit
Symbol
Description
7
LCR[7]
divisor latch enable
logic 0 = divisor latch disabled (normal default condition)
logic 1 = divisor latch enabled
6
LCR[6]
Break control bit. When enabled, the break control bit causes a break
condition to be transmitted (the TX output is forced to a logic 0 state).
This condition exists until disabled by setting LCR[6] to a logic 0.
logic 0 = no TX break condition (normal default condition).
logic 1 = forces the transmitter output (TX) to a logic 0 to alert the
communication terminal to a line break condition
5
LCR[5]
Set parity. LCR[5] selects the forced parity format (if LCR[3] = 1).
logic 0 = parity is not forced (normal default condition).
LCR[5] = logic 1 and LCR[4] = logic 0: parity bit is forced to a logical 1
for the transmit and receive data.
LCR[5] = logic 1 and LCR[4] = logic 1: parity bit is forced to a logical 0
for the transmit and receive data.
4
LCR[4]
parity type select
logic 0 = odd parity is generated (if LCR[3] = 1)
logic 1 = even parity is generated (if LCR[3] = 1)
3
LCR[3]
parity enable
logic 0 = no parity (normal default condition).
logic 1 = a parity bit is generated during transmission and the receiver
checks for received parity
2
LCR[2]
Number of stop bits. Specifies the number of stop bits.
0 to 1 stop bit (word length = 5, 6, 7, 8)
1 to 1.5 stop bits (word length = 5)
1 = 2 stop bits (word length = 6, 7, 8)
1:0
LCR[1:0]
Word length bits 1, 0. These two bits specify the word length to be
transmitted or received; see Table 15.


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