REV. 1.4.3 34 4.5 Infrared Mode Each UART in the 158 includes the infrared encoder and decoder " />
參數資料
型號: XR17C158CV-F
廠商: Exar Corporation
文件頁數: 28/67頁
文件大?。?/td> 0K
描述: IC UART PCI BUS 5V OCTAL 144LQFP
產品培訓模塊: UART Product Overview
標準包裝: 60
特點: *
通道數: 8
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 4.5 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:
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
其它名稱: 1016-1287
XR17C158
xr
5V PCI BUS OCTAL UART
REV. 1.4.3
34
4.5
Infrared Mode
Each UART in the 158 includes the infrared encoder and decoder compatible to the IrDA (Infrared Data
Association) version 1.0. The input pin ENIR conveniently activates all 8 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[7:0], will idle LOW. Likewise, the RX [7:0] inputs assume an
idling condition when it is LOW.
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
The infrared decoder receives the input pulse from the infrared sensing diode on RX pin. Each time the
decoder senses a light pulse, it returns a logic 0 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 15. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
Start
Stop
00
0
11
1 1
1
Bit Time
1/16 Clock Delay
IRdecoder-
RX Data
Receive
IR Pulse
(RX pin)
Character
Data Bits
Sta
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
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