Motorola MPC823e - Page 741

Communication Processor Module
MOTOROLA MPC823e REFERENCE MANUAL 16-287
COMMUNICATION
16
PROCESSOR MODULE
SCCs
13.Program the transmit and receive control character tables.
14.Initialize all RX buffer descriptors.
15.Initialize all TX buffer descriptors.
16.Clear the SCCE–ASYNC HDLC register by writing 0xFFFF to it.
17.Program the SCCM–ASYNC HDLC register with the proper mask to allow all preferred
interrupts.
18.Program the GSMR_H register.
19.Program the GSMR_L register to asynchronous HDLC mode, but do not turn on the
transmitter or receiver.
20.Set the PSMR–SCC ASYNC HDLC appropriately.
21.Turn on the transmitter and receiver in the GSMR_L register by setting the ENT and
ENR bits.
16.9.20 The SCC2 in IrDA Mode
IrDA is a family of specifications intended to facilitate the interconnection of computers and
peripherals using a directed half duplex serial infrared physical communications medium.
The infrared data association (IrDA) physical layer standard version 1.1 specifies three
modes of operation, each one with a distinct modulation scheme and signaling rate.
• Low-speed—2.4Kb/s to 115.2Kb/s
• Middle-speed—0.576Mb/s or 1.152Mb/s
• High-speed—4Mb/s
MPC823e
Figure 16-93. Serial IrDA Link
Note: Serial communication controller 3 (SCC3) does not operate in IrDA mode.
IR TRANSMIT
ENCODER
IR RECEIVE
DECODER
ENCODER/
DECODER
MODULE
IR
TRANSDUCER
MODULE
OUTPUT
DRIVER&LED
DETECTOR
& RECEIVER
IR OUT
IR IN
SCC2
TXD2
RXD2