UPSD3354DV-40U6 Datasheet, PDF (119/272 Pages) STMicroelectronics – fast 8032 MCU with programmable logic

UPSD33xx
22 IrDA interface
IrDA interface
Note:
UPSD33xx 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 Figure 35 and
Figure 36.
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.
In Figure 36 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 35. IrDA interface
olete ^{Product(s) UART1}
SIRClk
TxD
RxD
IrDA
Interf ac e
Obsolete ^{Product(s) - Obs UPSD33XX}
TxD1-IrDA
RxD1-IrDA
IrDA
Transceiver
AI07851b
Doc ID 9685 Rev 7
119/272