mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 746

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

Communication Processor Module
16.9.20.5.3 Low-Speed IrDA Programming Guide. Low-speed infrared programming is
very similar to SCC2 ASYNC HDLC programming. The only difference is the value of EOF
and BOF in the SCC2 parameter RAM and the programming of the IRMODE register. Use
the following initialization sequence for low-speed infrared.
1. Initialize the SDCR with the appropriate arbitration ID.
2. Configure the port A and port C pins to enable RXD2 and TXD2. This assumes you
3. Configure a baud rate generator to generate the appropriate channel clocking
4. Program the SICR to route the baud rate generator clocking to an SCC2 in
5. Select whether the channel is using the time-slot assigner or the NMSI pins in the
6. Write RBASE and TBASE in the SCC2 parameter RAM to point to the first RX and TX
7. Issue the INIT RX AND TX PARAMS command to SCC2.
8. Program RFCR and TFCR.
9. Write MRBLR with the maximum receive buffer size.
10. Write C_MASK and C_PRES with the standard values.
11. Write 0xC0 to BOF, 0xC1 to EOF and 0x7D to ESC.
12. Write 0 to the ZERO register in the SCC2 parameter RAM.
13. Program the RFTHR to the number of frames that must be received before an interrupt
14. Program the transmit and receive control character tables.
15. Initialize all RX buffer descriptors.
16. Initialize all TX buffer descriptors.
17. Clear the SCCE–ASYNC HDLC register by writing 0xFFFF to it.
18. Program the SCCM–ASYNC HDLC register with the proper mask to allow all desired
19. Program the GSMR_H.
20. Program the MODE field of the GSMR_L to SCCx ASYNC HDLC mode, but do not
21. Write 0x0001 to the IRMODE register to enable low-speed infra-red.
22. Set the PSMR–SCC ASYNC HDLC register appropriately.
23. Turn on the transmitter and receiver in the GSMR_L by setting the ENT and ENR bits.
are using NMSI mode. If not, appropriately configure the time-slot assigner and pins.
frequency.
asynchronous HDLC mode.
SICR.
buffer descriptors.
is generated.
interrupts.
turn on the transmitter or receiver.
Freescale Semiconductor, Inc.
For More Information On This Product,
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
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