參數(shù)資料
型號(hào): XR16L2551IL
廠商: EXAR CORP
元件分類: 微控制器/微處理器
英文描述: LOW VOLTAGE DUART WITH POWERSAVE
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): 19/48頁
文件大小: 287K
代理商: XR16L2551IL
á
REV. 1.0.0
XR16L2551
LOW VOLTAGE DUART WITH POWERSAVE
19
2.15
The L2551 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
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XR16L2551IM 制造商:EXAR 制造商全稱:EXAR 功能描述:LOW VOLTAGE DUART WITH POWERSAVE