Datasheet

Section 20 Serial Communication Interface 3 (SCI3, IrDA)
Page 720 of 982 REJ09B0465-0300 Rev. 3.00
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
20.6 IrDA Operation
The SCI3_2 provides the IrDA function. If the IrDA function is enabled using the IrE bit in IrCR,
the TXD_2 and RXD_2 pins in SCI3_2 are allowed to encode and decode the waveform based on
the IrDA Specifications version 1.0 (function as the IrTxD and IrRxD pins)*. Connecting these
pins to the infrared data transceiver achieves infrared data communications based on the system
defined by the IrDA Specifications version 1.0.
In the system defined by the IrDA Specifications version 1.0, communication is started at a
transfer rate of 9600 bps, which can be modified later as required. Since the IrDA interface
provided by this LSI does not incorporate the capability of automatic modification of the transfer
rate, the transfer rate must be modified through programming.
Figure 20.19 is the IrDA block diagram.
IrDA
Pulse encoder
Pulse decoder
IrCR
TXD_2/IrTxD
RXD_2/IrRxD
SCI3_2
TXD
RXD
Phase
inversion
Phase
inversion
Figure 20.19 IrDA Block Diagram
IrDA operation should be set according to the following procedures.
(1) Set the corresponding pin in the PMCR register or PMR register.
(2) Set the IrCR register.
(3) Set the register related to SCI3_2.