SC16C550IN40 NXP Semiconductors, SC16C550IN40 Datasheet - Page 25

• Manufacturer Part Number: SC16C550IN40
• Manufacturer: NXP Semiconductors

Specifications of SC16C550IN40

• Transmit Fifo: 16Byte
• Receive Fifo: 16Byte
• Transmitter And Receiver Fifo Counter: Yes
• Package Type: PDIP
• Operating Supply Voltage (max): 5.5V
• Mounting: Through Hole
• Pin Count: 40
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Number Of Channels: 1
• Lead Free Status / RoHS Status: Compliant

Philips Semiconductors
9397 750 11619
Product data
7.5 Line Control Register (LCR)
The Line Control Register is used to specify the asynchronous data communication
format. The word length, the number of stop bits, and the parity are selected by
writing the appropriate bits in this register.
Table 14:
[1]
Bit
7
6
5
4
3
2
1-0
When LCR[7] = 1, the general register set cannot be accessed until LCR[7] = 0.
Symbol
LCR[7]
LCR[6]
LCR[5]
LCR[4]
LCR[3]
LCR[2]
LCR[1-0]
Line Control Register bits description
[1]
Rev. 05 — 19 June 2003
Description
Divisor latch enable. The internal baud rate counter latch and Enhance
Feature mode enable.
Set break. 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.
Set parity. If the parity bit is enabled, LCR[5] selects the forced parity
format. Programs the parity conditions (see
Even parity. If the parity bit is enabled with LCR[3] set to a logic 1,
LCR[4] selects the even or odd parity format.
Parity enable. Parity or no parity can be selected via this bit.
Stop bits. The length of stop bit is specified by this bit in conjunction with
the programmed word length (see
Word length bits 1, 0. These two bits specify the word length to be
transmitted or received (see
Logic 0 = Divisor latch disabled (normal default condition).
Logic 1 = Divisor latch and enhanced feature register enabled.
Logic 0 = no TX break condition (normal default condition).
Logic 1 = forces the transmitter output (TX) to a logic 0 for alerting the
remote receiver to a line break condition.
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.
Logic 0 = ODD Parity is generated by forcing an odd number of
logic 1s in the transmitted data. The receiver must be programmed to
check the same format (normal default condition).
Logic 1 = EVEN Parity is generated by forcing an even number of
logic 1s in the transmitted data. The receiver must be programmed to
check the same format.
Logic 0 = no parity (normal default condition).
Logic 1 = a parity bit is generated during the transmission, receiver
checks the data and parity for transmission errors.
Logic 0 or cleared = default condition.
Logic 0 or cleared = default condition.
UART with 16-byte FIFO and IrDA encoder/decoder
Table
Table
17).
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
16).
Table
SC16C550
15).
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