xr16v654 Exar Corporation, xr16v654 Datasheet - Page 23
xr16v654
Manufacturer Part Number
xr16v654
Description
2.25v To 3.6v Quad Uart With 64-byte Fifo
Manufacturer
Exar Corporation
Datasheet
1.XR16V654.pdf
(58 pages)
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REV. 1.0.1
The V654 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.
F
2.16
IGURE
13. I
Infrared Mode
NFRARED
T
RANSMIT
TX Data
Transmit
(TX Pin)
IR Pulse
Receive
IR Pulse
(RX pin)
RX Data
D
ATA
0
E
Bit Time
NCODING AND
Bit Time
0
1
1/16 Clock Delay
1
Figure 13
Figure
0
0
1
Character
13.
Data Bits
1
R
23
0
below.
ECEIVE
Data Bits
Character
3/16 Bit Time
0
2.25V TO 3.6V QUAD UART WITH 64-BYTE FIFO
0
0
D
1
ATA
1
1
D
1
ECODING
0
0
1
1/2 Bit Time
1
IRdecoder-1
IrEncoder-1
XR16V654/654D