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UPSD3422 Datasheet(PDF) 119 Page - STMicroelectronics

Part # UPSD3422
Description  Turbo Plus series Fast Turbo 8032 MCU with USB and programmable logic
PDF  300 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UPSD3422 Datasheet(HTML) 119 Page - STMicroelectronics

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Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
UPSD3422, UPSD3433, UPSD3434, UPSD3454
IrDA interface
119/300
22
IrDA interface
UPSD34xx devices provide an internal IrDA interface that will allow the connection of the
UART1 serial interface directly to an external infrared transceiver device. The IrDA interface
does this by automatically shortening the pulses transmitted on UART1’s TxD1 pin, and
stretching the incoming pulses received on the RxD1 pin. Reference Figures 38 and 39.
When the IrDA interface is enabled, the output signal from UART1’s transmitter logic on pin
TxD1 is compliant with the IrDA Physical Layer Link Specification v1.4 (www.irda.org)
operating from 1.2k bps up to 115.2k bps. The pulses received on the RxD1 pin are
stretched by the IrDA interface to be recognized by UART1’s receiver logic, also adhering to
the IrDA specification up to 115.2k bps.
Note:
In Figure 39 a logic '0' in the serial data stream of a UART Frame corresponds to a logic high
pulse in an IR Frame. A logic '1' in a UART Frame corresponds to no pulse in an IR Frame.
Figure 38.
IrDA interface
Figure 39.
Pulse shaping by the IrDA interface
UART1
IrDA
Interface
TxD
RxD
uPSD34xx
IrDA
Transceiver
TxD1-IrDA
RxD1-IrDA
SIRClk
AI10437
Start
bit
01
0
1
1
1
1
00
0
Stop
bit
UART frame
Data bits
Bit time
Pulse width = 3/16 bit time
Start
bit
01
0
1
1
1
1
00
0
Stop
bit
UART frame
IR frame
IR frame
Data bits
AI10438
Obsolete
Product(s)
- Obsolete
Product(s)



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