Irda Function Block Diagram - Samsung S3C2416 User Manual

UART
2.1.8 Loopback Mode
The S3C2416 UART provides a test mode referred to as the Loopback mode, to aid in isolating faults in the
communication link. This mode structurally enables the connection of RXD and TXD in the UART. In this mode,
therefore, transmitted data is received to the receiver, via RXD. This feature allows the processor to verify the
internal transmit and to receive the data path of each SIO channel. This mode can be selected by setting the
loopback bit in the UART control register (UCONn).
2.1.9 Infrared (IR) Mode
The S3C2416 UART block supports infrared (IR) transmission and reception, which can be selected by setting the
Infrared-mode bit in the UART line control register (ULCONn). Figure 14-4 illustrates how to implement the IR
mode.
In IR transmit mode, the transmit pulse comes out at a rate of 3/16, the normal serial transmit rate (when the
transmit data bit is zero); In IR receive mode, the receiver must detect the 3/16 pulsed period to recognize a zero
value (see the frame timing diagrams shown Figure 14-6 and Figure 14-7).
UART
Block
14-8
TxD
IRS
RxD
RE
IrDA Tx
Encoder
Figure 14-4. IrDA Function Block Diagram
S3C2416X RISC MICROPROCESSOR
0
1
0
1
IrDA Rx
Decoder
TxD
RxD