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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
19-6
Freescale Semiconductor
enabled, and no hardware trigger events will be captured. No capturing of hardware trigger events means
that — as long as the system clock is running — CFIFOs can still be triggered using software triggers
because no scheme is implemented to write-protect registers during stop mode.
If at the time the stop mode entry request is detected, there are commands in the ADC that were already
under execution, these commands will be completed but the generated results, if any, will not be sent to
the RFIFOs until stop mode is exited. Commands whose execution has not started will not be executed
until stop mode is exited.
After these remaining commands are executed, the clock input to the ADCs is stopped. The time base
counter will stop after all on-chip ADCs cease executing commands and then the stop acknowledge signal
is asserted. When exiting stop mode, the eQADC relies on the CFIFO operation modes and on the CFIFO
status to determine the next command entry to transfer.
The eQADC internal behavior after the stop mode entry request is detected differs depending on the status
of the command transfer.
•
No command transfer is in progres.s
The eQADC immediately halts future command transfers from any CFIFO.
If a null message is being transmitted, eQADC will complete the transmission before halting future
command transfers. If valid data (conversion result or data read from an ADC register) is received
at the end of the transmission, it will not be sent to an RFIFO until stop mode is exited.
If the null message transmission is aborted, the eQADC will complete the abort procedure before
halting future command transfers from any CFIFO. The message of the CFIFO that caused the
abort of the previous serial transmission will only be transmitted after stop mode is exited.
•
Command transfer is in progress.
The eQADC will complete the transfer and update CFIFO status before halting future command
transfers from any CFIFO.
Command transfers to the external device are considered completed when the serial transmission
of the command is completed. If valid data (conversion result or data read from an ADC register)
is received at the end of a serial transmission, it will not be sent to an RFIFO until stop mode is
exited. The CFIFO status bits will still be updated after the completion of the serial transmission,
therefore, after stop mode entry request is detected, the eQADC status bits will only stop changing
several system clock cycles after the on-going serial transmission completes.
If the command message transmission is aborted, the eQADC will complete the abort procedure
before halting future command transfers from any CFIFO. The message of the CFIFO that caused
the abort of the previous serial transmission will only be transmitted after stop mode is exited.
•
Command/null message transfer through serial interface was aborted but next serial transmission
did not start.
If the stop mode entry request is detected between the time a previous serial transmission was
aborted and the start of the next transmission, the eQADC will complete the abort procedure before
halting future command transfers from any CFIFO. The message of the CFIFO that caused the
abort of the previous serial transmission will only be transferred after stop mode is exited.
19.2
External Signals
The following is a list of external signals. These signals are external to the eQADC module, but may or
may not be physical pins. See
Chapter 2, “Signal Description
” for a complete list of all physical pins and
signals.
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