REV. 1.2.2 UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART 33 5.5 Infrared Mode Each UART in the D154 includes the infrared" />
參數(shù)資料
型號: XR17D154CV
廠商: Exar Corporation
文件頁數(shù): 27/69頁
文件大?。?/td> 0K
描述: IC UART PCI BUS QUAD 144LQFP
產(chǎn)品變化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
標準包裝: 60
特點: *
通道數(shù): 4,QUART
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 3.3V,5V
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:
安裝類型: 表面貼裝
封裝/外殼: 144-LQFP
供應商設備封裝: 144-LQFP(20x20)
包裝: 托盤
xr
XR17D154
REV. 1.2.2
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
33
5.5
Infrared Mode
Each UART in the D154 includes the infrared encoder and decoder compatible to the IrDA (Infrared Data
Association) version 1.0. The input pin ENIR conveniently activates all 4 UART channels to start up in the
infrared mode. The ENIR pin is sampled when the RST# input is de-asserted. This global control pin enables
the MCR bit-6 function in every UART channel register. After power up or a reset, the software can overwrite
MCR bit-6 if so desired. ENIR and MCR bit-6 also disable its receiver while the transmitter is sending data. This
prevents the echoed data from going to the receiver. The global activation ENIR pin prevents the infrared
emitter from turning on and drawing large amount of current while the system is starting up. When the infrared
feature is enabled, the transmit data outputs, TX[3:0], would idle at logic zero level. Likewise, the RX[3:0]
inputs assume an idle level of logic zero.
The infrared encoder sends out a 3/16 of a bit wide 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
below.
The infrared decoder receives the input pulse from the infrared sensing diode on RX pin. Each time it senses a
light pulse, it returns a logic zero to the data bit stream. The RX input signal may be inverted prior delivered to
the input of the decoder via internal register setting. This option supports active low instead of normal active
high pulse from some infrared modules on the market.
FIGURE 17. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
St
a
rt
Stop
00
0
11
1
TX Data
Transmit
IR Pulse
(TX Pin)
Bit Time
1/2 Bit Time
3/16 Bit Time
IrEncoder-1
Character
Data Bits
St
ar
t
St
op
00
0
11
1
Bit Time
1/16 Clock Delay
IRdecoder-1
RX Data
Receive
IR Pulse
(RX pin)
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