參數(shù)資料
型號(hào)： XR17D152CMTR-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 26/68頁(yè)
文件大?。?/td> 0K
描述： IC UART PCI BUS DUAL 100TQFP
標(biāo)準(zhǔn)包裝： 1,000
特點(diǎn)： *
通道數(shù)： 2，DUART
FIFO's： 64 字節(jié)
規(guī)程： RS485
電源電壓： 3.3V，5V
帶自動(dòng)流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
帶調(diào)制解調(diào)器控制功能： 是
安裝類(lèi)型： 表面貼裝
封裝/外殼： 100-TQFP
供應(yīng)商設(shè)備封裝： 100-TQFP（14x14）
包裝： 帶卷 (TR)
XR17D152
á
UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
REV. 1.2.0
32
5.5
Infrared Mode
Each UART in the D152 includes the infrared encoder and decoder compatible to the IrDA (Infrared Data
Association) version 1.0. The input pin ENIR conveniently activates both UART channels to start up in the
infrared mode. 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[1:0], would
idle at logic zero level. Likewise, the RX[1:0] 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
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
C haracter
D ata B its
St
a
rt
St
o
p
00
0
11
1
TX D ata
Transm it
IR Pulse
(TX P in)
Bit Tim e
1/2 B it Tim e
3/16 B it Tim e
IrEncoder-1
C haracter
D ata Bits
St
ar
t
St
op
00
0
11
1
Bit Tim e
1/16 C lock Delay
IRdecoder-1
RX Data
Receive
IR Pulse
(R X pin)
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