Table of Contents
Advertisement
4. If an
INIT TX PARAMETERS
command.
TRANSMIT
5. Set GSMR_L[ENT]. Transmission begins using the TxBD pointed to by TBPTR,
assuming the R bit is set.
19.3.8.2 Reset Sequence for an SCC Transmitter
The following steps reinitialize an SCC transmit parameters to the reset state:
1. Clear GSMR_L[ENT].
2. Make any modiÞcations then issue the
3. Set GSMR_L[ENT].
19.3.8.3 General ReconÞguration Sequence for an SCC Receiver
An SCC receiver can be reconÞgured by following these steps:
1. Clear GSMR_L[ENR]. The SCC receiver is now disabled and put in a reset state.
2. Modify SCC Rx parameters or parameter RAM. To switch protocols or restore Rx
parameters to their initial state, issue an
3. If the
INIT RX PARAMETERS
command.
MODE
4. Set GSMR_L[ENR]. Reception begins using the RxBD pointed to by RBPTR,
assuming the E bit is set.
19.3.8.4 Reset Sequence for an SCC Receiver
To reinitialize the SCC receiver to the state it was in after reset, follow these steps:
1. Clear GSMR_L[ENR].
2. Make any modiÞcations then issue the
3. Set GSMR_L[ENR].
19.3.8.5 Switching Protocols
To switch an SCCÕs protocol without resetting the board or affecting other SCCs, follow
these steps:
1. Clear GSMR_L[ENT, ENR].
2. Make protocol changes in the GSMR and additional parameters then issue the
and
TX
RX PARAMETERS
3. Set GSMR_L[ENT, ENR] to enable the SCC with the new protocol.
19.3.9 Saving Power
To save power when not in use, an SCC can be disabled by clearing GSMR_L[ENT, ENR].
MOTOROLA
Chapter 19. Serial Communications Controllers (SCCs)
Part IV. Communications Processor Module
command was not issued in step 3, issue a
INIT TX PARAMETERS
INIT RX PARAMETERS
command was not issued in step 2, issue an
INIT RX PARAMETERS
command to initialize both Tx and Rx parameters.
RESTART
command.
command.
ENTER HUNT
command.
INIT
19-27
Advertisement
Table of Contents
