SC16C754 Philips Semiconductors, SC16C754 Datasheet - Page 24

• Manufacturer Part Number: SC16C754
• Description: Quad UART with 64-byte FIFO
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 11618
Product data
7.4 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
Table 12:
Bit
7
6
5
4
3
2
1-0
Symbol
LCR[7]
LCR[6]
LCR[5]
LCR[4]
LCR[3]
LCR[2]
LCR[1-0]
shows the line control register bit settings.
Line Control Register bits description
Rev. 04 — 19 June 2003
Description
Divisor latch enable.
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.
Set parity. LCR[5] selects the forced parity format (if LCR[3] = 1).
Parity type select.
Parity enable.
Number of Stop bits. Specifies the number of stop bits.
Word length bits 1, 0. These two bits specify the word length to be
transmitted or received.
Logic 0 = Divisor latch disabled (normal default condition).
Logic 1 = Divisor latch enabled.
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.
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 (if LCR[3] = 1).
Logic 1 = EVEN Parity is generated (if LCR[3] = 1).
Logic 0 = no parity (normal default condition).
Logic 1 = a parity bit is generated during transmission and the
receiver checks for received parity.
0 = 1 stop bit (word length = 5, 6, 7, 8)
1 = 1.5 stop bits (word length = 5)
1 = 2 stop bits (word length = 6, 7, 8)
00 - 5 bits
01 - 6 bits
10 - 7 bits
11 - 8 bits
Quad UART with 64-byte FIFO
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
SC16C754
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