SC16C751B datasheet(16/32 Pages) NXP

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SC16C751B_2

Product data sheet

Rev. 02 — 10 October 2008

16 of 32

NXP Semiconductors

SC16C751B

5 V, 3.3 V and 2.5 V UART with 64-byte FIFOs

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 12.

Line Control Register bits description

Bit

Symbol

Description

LCR[7]

Divisor latch enable. The internal baud rate counter latch and Enhanced

Feature mode enable.

logic 0 = divisor latch disabled (normal default condition)

logic 1 = divisor latch and enhanced feature register enabled

LCR[6]

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.

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

LCR[5]

Set parity. If the parity bit is enabled, LCR[5] selects the forced parity format.

Programs the parity conditions (see Table 13).

logic 0 = parity is not forced (normal default condition)

LCR[5] = logic 1 and LCR[4] = logic 0: parity bit is forced to a logic 1 for the

transmit and receive data

LCR[5] = logic 1 and LCR[4] = logic 1: parity bit is forced to a logic 0 for the

transmit and receive data

LCR[4]

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.

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.

LCR[3]

Parity enable. Parity or no parity can be selected via this bit.

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

LCR[2]

Stop bits. The length of stop bit is speciﬁed by this bit in conjunction with the

programmed word length (see Table 14).

logic 0 or cleared = default condition

1:0

LCR[1:0]

Word length bit 1, bit 0. These two bits specify the word length to be

transmitted or received (see Table 15).

logic 0 or cleared = default condition

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