Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
18-6
Freescale Semiconductor
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 is not sent to an RFIFO until debug mode is exited.
The CFIFO status bits are still updated after the completion of the serial transmission, therefore,
after debug mode entry request is detected, the eQADC status bits stop changing several system
clock cycles after the on-going serial transmission completes.
If the command message transmission aborts, the eQADC completes 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 is transmitted only after debug mode exits.
•
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 completes 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 is transmitted only after debug mode exits.
18.1.4.3
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 stops during its low phase if the eQADC SSI is enabled,
and no hardware trigger events is 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 are completed but the generated results, if any, are not sent to the
RFIFOs until stop mode is exited. Commands whose execution has not started do not execute until stop
mode exits.
After these remaining commands are executed, the clock input to the ADCs is stopped. The time base
counter stops 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 progress
The eQADC immediately halts future command transfers from any CFIFO.
If a null message is being transmitted, eQADC completes 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 is not sent to an RFIFO until stop mode exits.
Содержание MPC5565
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Страница 895: ...Deserial Serial Peripheral Interface DSPI MPC5565 Microcontroller Reference Manual Rev 1 0 19 72 Freescale Semiconductor...
Страница 973: ...Preface MPC5565 Microcontroller Reference Manual Rev 1 0 21 36 Freescale Semiconductor...
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Страница 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...