20 GENERAL-PURPOSE SERIAL INTERFACE (FSIO)
20-20
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
RZI modulator input (I/F output)
RZI modulator output (SOUT
x
)
(1) IRTL = 0 (default)
When transmitting
RZI modulator input (I/F output)
RZI modulator output (SOUT
x
)
(2) IRTL = 1
RZI modulator input (SIN
x
)
RZI modulator output (I/F input)
(1) IRRL = 0 (default)
When receiving
RZI modulator input (SIN
x
)
RZI modulator output (I/F input)
(2) IRRL = 1
8.2.1 IRRL and IRTL Settings
Figure 20.
Control and Operation of IrDA Interface
20.8.3
The transmit/receive procedures have been explained in the section on the asynchronous interface, so refer to Sec-
tion 20.7.3, “Control and Operation of Asynchronous Transfer.”
The following describes the data modulation and demodulation performed using the RZI modulator circuit:
When transmitting
During data transmission, the pulse width of the serial interface output signal is set to 3/16 before the signal is
output from the SOUT
x
pin.
SIO_CLK
RZI modulator input (I/F output)
RZI modulator output (SOUT
x
)
1 2 3
8 9 10 11
16
3
×
SIO_CLK
16
×
SIO_CLK
8.3.1 Data Modulation by RZI Circuit
Figure 20.
When receiving
During data reception, the pulse width of the input signal from SIN
x
is set to 16/3 before the signal is trans-
ferred to the serial interface.
SIO_CLK
RZI modulator input (SIN
x
)
RZI modulator output (I/F input)
1 2 3 4
16
16
×
SIO_CLK
3
×
SIO_CLK
8.3.2 Demodulation by RZI Circuit
Figure 20.