MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
19-5
write-protect registers during debug mode. eDMA and interrupt requests continue to be generated as in
normal mode.
If at the time the debug 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 debug mode is exited. Commands whose execution has not started will not be executed
until debug mode is exited. The clock associated with an on-chip ADC stops, during its low phase, after
the ADC ceases executing commands. The time base counter will only stop after all on-chip ADCs cease
executing commands.
When exiting debug mode, the eQADC relies on the FIFO control unit and on the CFIFO status to
determine the next command entry to transfer.
The eQADC internal behavior after the debug mode entry request is detected differs depending on the
status of command transfers.
•
No command transfer is in progress.
The eQADC immediately halts future command transfers from any CFIFO.
If a null message is being transmitted, eQADC will complete the serial transmission before halting
future command transfers. If valid data (conversion result or data read from an ADC register) is
received by the result format and calibration submodule at the end of transmission, this data will
not be sent to an RFIFO until debug 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 debug mode is exited.
•
Command transfer is in progress.
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 debug mode is
exited. The CFIFO status bits will still be updated after the completion of the serial transmission,
therefore, after debug 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 debug mode is exited.
•
Command/null message transfer through serial interface was aborted but next serial transmission
did not start.
If the debug 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 transmitted after debug mode is exited.
19.1.4.3
Stop Mode
Upon a stop mode entry request detection, the eQADC progressively halts its operations until it reaches a
static, stable state from which it can recover when returning to normal mode. The eQADC then asserts an
acknowledge signal, indicating that it is static and that the clock input can be stopped. In stop mode, the
free running clock (FCK) output to external device will stop during its low phase if the eQADC SSI is
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