SH7763 Datasheet, PDF (1246/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 28 Serial Communication Interface with FIFO/IrDA Interface (SCIF/IrDA)
28.5.2 Operation of Infrared Data Communication Interface
Figure 28.22 shows a block diagram of the infrared data communication interface.
The infrared data communication interface selects whether serial communication data for the
SCIF2 channel is modulated/demodulated to the infrared data for transmission or reception.
When the IRMOD bit in SCSMRIR is 1, the modulated/demodulated IrDA data is input/output
from the SCIF2_TXD/SCIF2_RXD pin. When the IRMOD bit in SCSMRIR is 0, the data for the
SCIF2 channel is bypassed to the SCIF2_TXD/SCIF2_RXD pin.
When the LOOP bit in SCSMRIR is set to active, output from the infrared data modulation unit is
directly input to the demodulation unit (for loopback testing).
The selector does not use clocks for its logic. Therefore, the status of the selector after a reset or in
standby depends on only the value of SCSMRIR.
Note: This module can detect short pulses such as chattering in reception, be sure to secure the
shortest pulse width specified by the IrDA standard.
Infrared data communication interface
Serial data
transmission
s_txd
s_txd
Modulation unit
i_txd_n
IRMOD
s_txd
0 _{p_txd}
1
i_txd_n
SCIF2_TXD
Serial data
reception
IRMOD
s_rxd
1 ^{i_rxd Demodulation unit}
0 ^p_rxd
LOOP
1
i_rxdp_n
0
SCIF2
Channel
p_rxd p_rxd
SCIF2_RXD
Port logic block
Figure 28.22 Block Diagram of Infrared Data Communication Interface
Rev. 1.00 Oct. 01, 2007 Page 1180 of 1956
REJ09B0256-0100