13-10
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
The transmit data output from the UART3 Ch.
n
transmit shift register is output from the USOUT
n
pin
after the low pulse width is converted into 3/16 by the RZI modulator in SIR method.
Figure 13.5.4.2 IrDA Transmission Signal Waveform
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.
Figure 13.5.4.3 IrDA Receive Signal Waveform
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_
n
MOD.CAREN bit enables the carrier modulation function allowing carrier
modulation waveforms to be output according to the UART3_
n
MOD.PECAR bit setting. Data transmit
control is identical to that for normal interface even in this case.
Figure 13.5.5.1 Carrier Modulation Waveform
(UART3_
n
MOD.CHLN = 1, UART3_
n
MOD.STPB = 0, UART3_
n
MOD.PREN = 1)
The carrier modulation output frequency is determined by the UART3_
n
CAWF.CRPER[7:0] bit settings.
Use the following equations to calculate the setting values for obtaining the desired frequency.
𝐶𝑎𝑟𝑟𝑖𝑒𝑟 𝑚𝑜𝑑𝑢𝑙𝑎𝑡𝑖𝑜𝑛 𝑜𝑢𝑡𝑝𝑢𝑡 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 =
𝐶𝐿𝐾_𝑈𝐴𝑅𝑇3
(𝐶𝑅𝑃𝐸𝑅 + 1) × 2
[𝐻𝑧] (𝐸𝑞. 13.2)
Where
CLK_UART3: UART3 operating clock frequency [Hz]
CRPER: UART3_nCAWF.CRPER[7:0] setting value (0 to 255)
Modulator input (shift register output)
Modulator output (USOUT
n
)
3
16
T1
3
16
T1
T1
Demodulator input (USIN
n
)
Demodulator output (shift register input)
T2
CAREN = 0
CAREN = 1
PECAR = 0
CAREN = 1
PECAR = 1
CAREN = 0
CAREN = 1
PECAR = 0
CAREN = 1
PECAR = 1
USOUT
n
(INVTX = 0)
USOUT
n
(INVTX = 1)
Start
bit
Transmit data
1
0
0
1
1
0
1
0
Parity
bit
Stop
bit
Summary of Contents for S1C31D50
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