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Communication Processor Module
16.9.14.3 DISABLING THE ENTIRE SCCx RECEIVER. The SCCx receiver can be fully
disabled or enabled by following these steps:
1. Clear the ENR bit in the GSMR_L to disable the SCCx receiver and put it in a reset
state.
2. Make modifications to the SCCx receive parameters or to the parameter RAM. If you
want to switch protocols or restore the SCCx receive parameters to their initial state,
issue the INIT RX PARAMETERS command.
3. Issue the ENTER HUNT MODE command in the CPCR. This command is required if
the INIT RX PARAMETERS command was not issued in step 2.
4. Set the ENR bit in the GSMR_L. Reception begins using the RX buffer descriptor that
the RBPTR points to if the E bit is set in the TX buffer descriptor.
16.9.14.4 DISABLING PART OF THE SCCx RECEIVER. To reinitialize the SCCx
receiver to the state it was in after reset, follow this short sequence of steps:
1. Clear the ENR bit in the GSMR_L.
2. Issue the INIT RX PARAMETERS command in the CPCR and make any additional
modifications.
3. Set the ENR bit in the GSMR_L.
16.9.14.5 SWITCHING PROTOCOLS. Sometimes you may want to switch the protocol
that a serial communication controller is executing without resetting the board. You can use
one command and the following sequence of steps:
1. Clear the ENT and ENR bits in the GSMR_L.
2. Issue the INIT TX AND RX PARAMS command in the CPCR. This command
initializes both the transmit and receive parameters. Any additional modifications can
be made in the GSMR_L.
3. Set the ENT and ENR bits in the GSMR_L and the serial communication controller is
enabled with the new protocol.
Tip:
You can save power by clearing the ENT and ENR bits of the serial
communication controllers.
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MPC823e REFERENCE MANUAL
MOTOROLA
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