參數(shù)資料
型號: XR16L2550IL
廠商: EXAR CORP
元件分類: 微控制器/微處理器
英文描述: LOW VOLTAGE DUART WITH 16-BYTE FIFO
中文描述: 2 CHANNEL(S), 3.125M bps, SERIAL COMM CONTROLLER, QCC32
封裝: 5 X 5 MM, 0.90 MM HEIGHT, QFN-32
文件頁數(shù): 17/45頁
文件大小: 278K
代理商: XR16L2550IL
á
REV. 1.0.0
XR16L2550
LOW VOLTAGE DUART WITH 16-BYTE FIFO
17
2.16
The L2550 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 12
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 12
.
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 logic 1 to the data bit stream.
Infrared Mode
F
IGURE
12. 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
Bit Time
1/16 Clock Delay
IRdecoder-1
RX Data
Receive
IR Pulse
(RX pin)
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
相關(guān)PDF資料
PDF描述
XR16L2550IM LOW VOLTAGE DUART WITH 16-BYTE FIFO
XR16L2550 LOW VOLTAGE DUART WITH 16-BYTE FIFO
XR16L2551 LOW VOLTAGE DUART WITH POWERSAVE
XR16L2551IL LOW VOLTAGE DUART WITH POWERSAVE
XR16L2551IM LOW VOLTAGE DUART WITH POWERSAVE
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