xr16c2850im Exar Corporation, xr16c2850im Datasheet - Page 18
![no-image](/images/manufacturer_photos/0/2/243/exar_corporation_sml.jpg)
xr16c2850im
Manufacturer Part Number
xr16c2850im
Description
Dual Uart With Tx And Rx Fifo Counters, 128 Bytes Of Fifos And Automatic Rs-485 Half Duplex Control
Manufacturer
Exar Corporation
Datasheet
1.XR16C2850IM.pdf
(51 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
XR16C2850IM
Manufacturer:
EXAR
Quantity:
12
Part Number:
XR16C2850IM
Manufacturer:
EXAR/艾科嘉
Quantity:
20 000
Company:
Part Number:
xr16c2850im-F
Manufacturer:
XILINX
Quantity:
229
Company:
Part Number:
xr16c2850im-F
Manufacturer:
Exar Corporation
Quantity:
10 000
Part Number:
xr16c2850im-F
Manufacturer:
EXAR/艾科嘉
Quantity:
20 000
XR16C2850
2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS
The 2850 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
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
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. However, this is not true with some
infrared modules on the market which indicate a logic 0 by a light pulse. So the 2850 has a provision to invert
the input polarity to accomodate this. In this case user can enable FCTR bit-2 to invert the input signal.
2.18
Infrared Mode
F
IGURE
Receive
IR Pulse
(RX pin)
RX Data
TX Data
Transmit
IR Pulse
(TX Pin)
12. I
NFRARED
0
Bit Time
Bit Time
0
1
1/16 Clock Delay
T
RANSMIT
1
0
Figure 12
Figure
0
1
Character
Data Bits
D
1
12.
ATA
0
18
Data Bits
3/16 Bit Time
Character
below.
0
E
0
NCODING AND
0
1
1 1
1
0
R
0
ECEIVE
1/2 Bit Time
1
1
IRdecoder-
IrEncoder-1
D
ATA
D
ECODING
xr
REV. 2.1.3