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11.5.4 IrDA Interface
This UART3 includes an RZI modulator/demodulator circuit enabling implementation of IrDA 1.0-compatible in-
frared communication function simply by adding simple external circuits.
Set the UAnMOD.IRMD bit to 1 to use the IrDA interface.
Data transfer control is identical to that for normal interface even if the IrDA interface function is enabled.
S1C17 UART3
Figure 11.5.4.1 Example of Connections with an Infrared Communication Module
The transmit data output from the UART3 Ch.n transmit shift register is output from the USOUTn pin after the low
pulse width is converted into 3/16 by the RZI modulator in SIR method.
Modulator input (shift register output)
Modulator output (USOUTn)
The received IrDA signal is input to the RZI demodulator and the low pulse width is converted into the normal
width before input to the receive shift register.
Demodulator input (USINn)
Demodulator output (shift register input)
Notes: • Set the baud rate division ratio to 1/16 when using the IrDA interface function.
• The low pulse width (T
11.5.5 Carrier Modulation
The UART3 has a carrier modulation function.
Writing 1 to the UAnMOD.CAREN bit enables the carrier modulation function allowing carrier modulation wave-
forms to be output according to the UAnMOD.PECAR bit setting. Data transmit control is identical to that for nor-
mal interface even in this case.
S1C17M12/M13 TECHNICAL MANUAL
(Rev. 1.2)
RXD
USINn
VCC
V
DD
GND
V
SS
TXD
USOUTn
LEDA
T
Figure 11.5.4.2 IrDA Transmission Signal Waveform
T
2
Figure 11.5.4.3 IrDA Receive Signal Waveform
) of the IrDA signal input must be CLK_UART3 × 3 cycles or longer.
2
Seiko Epson Corporation
VCC
AMP
GND
Infrared communication module
1
3
T
1
16
11 UART (UART3)
3
T
1
16
11-7
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