參數資料
型號: XR16L2551IL
廠商: Exar Corporation
文件頁數: 21/49頁
文件大小: 0K
描述: IC UART FIFO 16B DUAL 32QFN
產品變化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
標準包裝: 490
特點: *
通道數: 2,DUART
FIFO's: 16 字節(jié)
規(guī)程: RS232,RS485
電源電壓: 2.25 V ~ 5.5 V
帶自動流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶調制解調器控制功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 32-VFQFN 裸露焊盤
供應商設備封裝: 32-QFN 裸露焊盤(5x5)
包裝: 托盤
XR16L2551
28
LOW VOLTAGE DUART WITH POWERSAVE
REV. 1.1.3
FCR[7:6]: Receive FIFO Trigger Select
(logic 0 = default, RX trigger level =1)
These 2 bits are used to set the trigger level for the receive FIFO. The UART will issue a receive interrupt when
the number of the characters in the FIFO crosses the trigger level. Table 11 shows the complete selections.
4.6
Line Control Register (LCR) - Read/Write
The Line Control Register is used to specify the asynchronous data communication format. The word or
character length, the number of stop bits, and the parity are selected by writing the appropriate bits in this
register.
LCR[1:0]: TX and RX Word Length Select
These two bits specify the word length to be transmitted or received.
LCR[2]: TX and RX Stop-bit Length Select
The length of stop bit is specified by this bit in conjunction with the programmed word length.
LCR[3]: TX and RX Parity Select
Parity or no parity can be selected via this bit. The parity bit is a simple way used in communications for data
integrity check. See Table 12 for parity selection summary below.
Logic 0 = No parity.
Logic 1 = A parity bit is generated during the transmission while the receiver checks for parity error of the
data character received.
TABLE 11: RECEIVE FIFO TRIGGER LEVEL SELECTION
FCR BIT-7
FCR BIT-6
RECEIVE
TRIGGER
LEVEL
COMPATIBILITY
0
1
0
1
0
1
1 (default)
4
8
14
16C550, 16C2550,
16C2552, 16C554,
16C580 compatible.
BIT-1
BIT-0
WORD LENGTH
0
5 (default)
0
1
6
1
0
7
1
8
BIT-2
WORD LENGTH
STOP BIT LENGTH (BIT TIME(S))
0
5,6,7,8
1 (default)
1
5
1-1/2
1
6,7,8
2
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