參數(shù)資料
型號: SC16C750BIB64
廠商: NXP Semiconductors N.V.
元件分類: 收發(fā)器
英文描述: 5 V, 3.3 V and 2.5 V UART with 64-byte FIFOs
封裝: SC16C750BIA44<SOT187-2 (PLCC44)|<<http://www.nxp.com/packages/SOT187-2.html<1<week 41, 2004,;SC16C750BIA44<SOT187-2 (PLCC44)|<<http://www.nxp.com/packages/SOT187-2.html&l
文件頁數(shù): 21/44頁
文件大小: 212K
代理商: SC16C750BIB64
SC16C750B_5
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 17 October 2008
21 of 44
NXP Semiconductors
SC16C750B
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 14.
Bit
7
Line Control Register bits description
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 15
).
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 16
).
logic 0 or cleared = default condition
LCR[1:0]
Word length bit 1, bit 0. These two bits specify the word length to be
transmitted or received (see
Table 17
).
logic 0 or cleared = default condition
6
5
4
3
2
1:0
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