HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 827

• Manufacturer Part Number: HD6412373R
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

15.8
When the IrDA function is enabled with bit IrE in IrCR, the SCI_0 TxD0 and RxD0 signals are
subjected to waveform encoding/decoding conforming to IrDA specification version 1.0 (IrTxD
and IrRxD pins). By connecting these pins to an infrared transceiver/receiver, it is possible to
implement infrared transmission/reception conforming to the IrDA specification version 1.0
system.
In the IrDA specification version 1.0 system, communication is started at a transfer rate of 9600
bps, and subsequently the transfer rate can be varied as necessary. As the IrDA interface in this
LSI does not include a function for varying the transfer rate automatically, the transfer rate setting
must be changed by software.
Figure 15.33 shows a block diagram of the IrDA function.
Transmission: In transmission, the output signal (UART frame) from the SCI is converted to an
IR frame by the IrDA interface (see figure 15.34).
When the serial data is 0, a high pulse of 3/16 the bit rate (interval equivalent to the width of one
bit) is output (initial value). The high-level pulse can be varied according to the setting of bits
IrCKS2 to IrCKS0 in IrCR.
IrDA Operation
TxD0/IrTxD
RxD0/IrRxD
Figure 15.33 Block Diagram of IrDA
Pulse encoder
Pulse decoder
IrCR
Section 15 Serial Communication Interface (SCI, IrDA)
IrDA
Rev.7.00 Mar. 18, 2009 page 759 of 1136
RxD
TxD
SCI0
REJ09B0109-0700