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參數(shù)資料
| 型號： | XR17L152 |
| 廠商： | Exar Corporation |
| 英文描述： | 3.3V PCI BUS DUAL UART |
| 中文描述： | 3.3V的PCI總線雙UART |
| 文件頁數(shù)： | 24/55頁 |
| 文件大?。?/td> | 318K |
| 代理商： | XR17L152 |
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DISCONTINUED
XR17L152
3.3V PCI BUS DUAL UART
REV. 1.1.0
24
4.3
Each UART in the L152 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
Figure 10
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. This option supports active low instead of normal active high pulse from some infrared
modules on the market.
Infrared Mode
F
IGURE
10. I
NFRARED
T
RANSMIT
D
ATA
E
NCODING
AND
R
ECEIVE
D
ATA
D
ECODING
Character
Data Bits
S
S
0
0
0
0
0
1
1
1
1
1
TX Data
Transmit
IR Pulse
(TX Pin)
Bit Time
1/2 Bit Time
3/16 Bit Time
IrEncoder-1
Character
Data Bits
S
S
0
0
0
0
0
1
1
1
1
1
Bit Time
1/16 Clock Delay
IRdecoder-1
RX Data
Receive
IR Pulse
(RX pin)
相關(guān)PDF資料 |
PDF描述 |
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| XR17L152CM | 3.3V PCI BUS DUAL UART |
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| XR2002CN | High-Voltage, High-Current Darlington Transistor Arrays |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR17L152CM | 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PCI BUS DUAL UART |
| XR17L152IM | 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PCI BUS DUAL UART |
| XR17L154 | 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PCI BUS QUAD UART |
| XR17L154CV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm/Datacomm |
| XR17L154IV | 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PCI BUS QUAD UART |
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