Toshiba H1 Series Data Book page 343

3.14.5 Support for IrDA
SIO0 includes support for the IrDA 1.0 infrared data communication specification.
Figure 3.14.8 shows the block diagram.
Transmisison
data
SIO0
Receive
data
TMP92CZ26A
(1) Modulation of the transmission data
When the transmit data is 0, the modem outputs 1 to TXD0 pin with either 3/16 or
1/16 times for width of baud-rate. The pulse width is selected by the SIRCR<PLSEL>.
When the transmit data is 1, the modem outputs 0.
Transmission
Start
data
TXD0 pin
(2) Modulation of the receive data
When the receive data is the effective width of pulse "1", the modem outputs "0" to
SIO0. Otherwise the modem outputs "1" to SIO0. The effective pulse width is selected
by SIRCR<SIRWD3 to SIRWD0>.
RXD0 pin
Receive data
Start
TXD0
IR modulator
Modem
RXD0
IR demodulator
Figure 3.14.18 Block Diagram
0 1 0
Figure 3.14.19 Transmission example
1 0 0
Figure 3.14.20 Receiving example
92CZ26A-340
IR transmitter & LED
IR output
IR receiver
IR input
0 1 1 0
1 0 1 1
TMP92CZ26A
0
Stop
0
Stop