ST16C654D Exar Corporation, ST16C654D Datasheet - Page 19
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ST16C654D
Manufacturer Part Number
ST16C654D
Description
St16c654d -quad Uart With 64-byte Fifo And Infrared Irda Encoder/decoder
Manufacturer
Exar Corporation
Datasheet
1.ST16C654D.pdf
(51 pages)
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xr
REV. 5.0.2
The 654 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.
2.15
Infrared Mode
F
IGURE
Receive
IR Pulse
(RX pin)
RX Data
TX Data
Transmit
(TX Pin)
IR Pulse
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
12.
D
1
ATA
0
19
3/16 Bit Time
Data Bits
below.
Character
0
E
2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
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
ST16C654/654D