HD6432142 datasheet(527/1177 Pages) RENESAS

527 / 1177 page

Section 15 Serial Communication Interface (SCI, IrDA)

Rev. 4.00 Sep 27, 2006 page 483 of 1130

REJ09B0327-0400

15.3.5

IrDA Operation

Figure 15.21 shows a block diagram of the IrDA function.

When the IrDA function is enabled with bit IrE in KBCOMP, the SCI channel 2 TxD2 and RxD2

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 the this

LSI does not include a function for varying the transfer rate automatically, the transfer rate setting

must be changed by software.

IrDA

Pulse encoder

Pulse decoder

KBCOMP

TxD2/IrTxD

RxD2/IrRxD

SCI2

TxD

RxD

Figure 15.21 Block Diagram of 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 15.22).

When the serial data is 0, a high-level pulses 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 KBCOMP.

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