参数资料
型号: XR16L2550IMTR-F
厂商: Exar Corporation
文件页数: 9/44页
文件大小: 0K
描述: IC UART FIFO 16B DUAL 48TQFP
标准包装: 1,500
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: 48-TQFP
供应商设备封装: 48-TQFP(7x7)
包装: 带卷 (TR)
XR16L2550
17
REV. 1.1.3
LOW VOLTAGE DUART WITH 16-BYTE FIFO
2.17
Infrared Mode
The L2550 UART includes the infrared encoder and decoder compatible to the IrDA (Infrared Data
Association) version 1.0. The IrDA 1.0 standard that stipulates the infrared encoder sends out a 3/16 of a bit
wide HIGH-pulse for each “0” bit in the transmit data stream. This signal encoding reduces the on-time of the
infrared LED, hence reduces the power consumption. See Figure 12 below.
The infrared encoder and decoder are enabled by setting MCR register bit-6 to a ‘1’. When the infrared feature
is enabled, the transmit data output, TX, idles at logic zero level. Likewise, the RX input assumes an idle level
of logic zero from a reset and power up, see Figure 12.
Typically, the wireless infrared decoder receives the input pulse from the infrared sensing diode on the RX pin.
Each time it senses a light pulse, it returns a logic 1 to the data bit stream.
FIGURE 12. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
Start
Stop
00
0
11
1 11
Bit Time
1/16 Clock Delay
IRdecoder-
RX Data
Receive
IR Pulse
(RX pin)
Character
Data Bits
St
ar
t
Sto
p
00
0
11
1
TX Data
Transmit
IR Pulse
(TX Pin)
Bit Time
1/2 Bit Time
3/16 Bit Time
IrEncoder-1
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