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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 (T2) of the IrDA signal input must be CLK_UART3_n × 3 cycles or longer.
13.5.5. Carrier Modulation
The UART3 has a carrier modulation function.
Writing 1 to the UART3_nMOD.CAREN bit enables the carrier modulation function allowing carrier
modulation waveforms to be output according to the UART3_nMOD.PECAR bit setting. Data transmit
control is identical to that for normal interface even in this case.
Transmit data
CAREN = 0
CAREN = 1
USOUTn
PECAR = 0
(INVTX = 0)
CAREN = 1
PECAR = 1
CAREN = 0
CAREN = 1
USOUTn
PECAR = 0
(INVTX = 1)
CAREN = 1
PECAR = 1
(UART3_nMOD.CHLN = 1, UART3_nMOD.STPB = 0, UART3_nMOD.PREN = 1)
The carrier modulation output frequency is determined by the UART3_nCAWF.CRPER[7:0] bit settings.
Use the following equations to calculate the setting values for obtaining the desired frequency.
�������������� �������������������� ������������ ������������������ =
Where
CLK_UART3: UART3 operating clock frequency [Hz]
CRPER: UART3_nCAWF.CRPER[7:0] setting value (0 to 255)
13-10
T1
Figure 13.5.4.2 IrDA Transmission Signal Waveform
T2
Figure 13.5.4.3 IrDA Receive Signal Waveform
Start
1
0
bit
Figure 13.5.5.1 Carrier Modulation Waveform
Seiko Epson Corporation
3
T1
16
0
1
1
0
1
������_��������3
[ ���� ]
(���������� + 1) × 2
3
T1
16
Stop
Parity
0
bit
bit
(����. 13.2)
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
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