Control And Operation Of Irda Interface - Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual

Control and Operation of IrDA Interface

The transmit/receive procedures have been explained in the section on the asynchronous interface, so refer to
"Control and Operation of Asynchronous Transfer".
The following describes the data modulation and demodulation performed using the PPM 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 SOUTx pin.
PPM modulator input (I/F output)
PPM modulator output (SOUTx)
When receiving
During data reception, the pulse width of the input signal from SINx is set to 16/3 before the signal is
transferred to the serial interface.
PPM modulator input (SINx)
PPM modulator output (I/F input)
Note: When using the IrDA interface, set the internal division ratio of the serial interface 1/16 (DIVMDx =
"1"), rather than 1/8 (DIVMDx = "0").
S1C33L03 FUNCTION PART
TCLK
1 2 3
Figure 8.16 Data Modulation by PPM Circuit
TCLK
1 2 3 4
3 TCLK
Figure 8.17 Demodulation by PPM Circuit
EPSON
III PERIPHERAL BLOCK: SERIAL INTERFACE
8 9 10 11 16
3 TCLK
16 TCLK
A-1
16 TCLK
16
B-III
SIF
B-III-8-23