Communication Processor Module
16-392
MPC823e REFERENCE MANUAL
MOTOROLA
SMC
COMMUNICATION
16
PROCESSOR MODULE
16.11.5.4 DISABLING PART OF THE SMCx RECEIVER.
Follow this shorter sequence to
reinitialize the receive parameters to the state they were in after reset.
1. Clear the REN bit in the SMCMR.
2.
INIT RX PARAMETERS
command and make any additional modifications.
3. Set the REN bit in the SMCMR.
16.11.5.5 SWITCHING PROTOCOLS.
To switch a protocol that is being executed by a
serial management controller without resetting the board or affecting any other serial
management controller:
1. Clear the TEN and REN bits in the SMCMR.
2. Issue the
INIT TX AND RX PARAMS
command to initialize the transmit and receive
parameters. Make any additional modifications in the SMCMR.
3. Set the TEN and REN bits in the SMCMR. The serial management controller is now
enabled with the new protocol.
16.11.6 The SMCx in UART Mode
Compared to an SCCx in UART mode, the serial management controllers are designed to
support simple debug/monitor ports instead of full-featured UART controllers. The following
is a list of the features that the SMCx in UART mode does not support.
• RTSx
, CTSx, and CDx pins
• Receive and transmit sections clocked at different rates
• Fractional stop bits
• Built-in multidrop modes
• Freeze mode for implementing flow control
• Isochronous operation
(1
×
clock
)
• Interrupts on special control character reception
• Ability to transmit data on demand using the transmit on demand register
Tip:
You can save power by clearing the TEN and REN bits of a serial management
controller.
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