参数资料
型号: XR16M2651IM48-F
厂商: Exar Corporation
文件页数: 13/51页
文件大小: 0K
描述: IC UART FIFO 32B DUAL 48TQFP
标准包装: 250
特点: *
通道数: 2,DUART
FIFO's: 32 字节
规程: RS232,RS422
电源电压: 1.62 V ~ 3.63 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: 托盘
XR16M2651
20
HIGH PERFORMANCE DUART WITH 32-BYTE FIFO AND POWERSAVE FEATURE
REV. 1.0.2
2.16
Infrared Mode
The M2651 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 11 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 11.
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 HIGH to the data bit stream. However, this is not true with some
infrared modules on the market which indicate a LOW by a light pulse. So the M2651 has a provision to invert
the input polarity to accommodate this. In this case user can enable MCR bit-2 to invert the input signal.
FIGURE 11. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
Start
St
op
00
0
11
1
Bit Time
1/16 Clock Delay
IRdecoder-1
RX Data
Receive
IR Pulse
(RX pin)
Character
Data Bits
Sta
rt
St
op
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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