参数资料
型号: XR16L2550IL
厂商: Exar Corporation
文件页数: 19/44页
文件大小: 0K
描述: IC UART FIFO 16B DUAL 32QFN
产品变化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
标准包装: 490
特点: *
通道数: 2,DUART
FIFO's: 16 字节
规程: RS232
电源电压: 2.25 V ~ 5.5 V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
供应商设备封装: 32-QFN 裸露焊盘(5x5)
包装: 托盘
XR16L2550
26
LOW VOLTAGE DUART WITH 16-BYTE FIFO
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 10 shows the complete selections.
TABLE 10: 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.
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.
WORD LENGTH
0
5 (default)
0
1
6
1
0
7
1
8
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.
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
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 11 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.
BIT-1
BIT-0
BIT-2
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