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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
19-23
2
PFn
Pause flag n. PF behavior changes according to the CFIFO trigger mode.
• In edge trigger mode, PFn is set when the eQADC completes the transfer of an entry
with an asserted pause bit from CFIFOn.
• In level trigger mode, when CFIFOn is in the TRIGGERED state, PFn is set when CFIFO
status changes from TRIGGERED due to the detection of a closed gate.
An interrupt routine, generated due to the asserted PF, can be used to verify if a complete
scan of the user-defined command queue was performed. If a closed gate is detected while
no command transfers are taking place, it will have immediate effect on the CFIFO status.
If a closed gate is detected while a command transfer to an on-chip ADC is taking place, it
will only affect the CFIFO status when the transfer completes. If a closed gate is detected
during the serial transmission of a command to the external device, it will have no effect on
the CFIFO status until the transmission completes.
The transfer of entries bound for the on-chip ADCs is considered completed when they are
stored in the appropriate ADC command buffer. The transfer of entries bound for the
external device is considered completed when the serial transmission of the entry is
completed. In software trigger mode, PFn will never become asserted.
If PIEn (See Section 19.3.2.7) and PFn are asserted, an interrupt will be generated. Writing
a 1 clears the PFn. Writing a 0 has no effect. Refer to
Section 19.4.3.6.3, “Pause Status
,”
for more information on pause flag.
0 Entry with asserted pause bit was not transferred from CFIFOn (CFIFO in edge trigger
mode), or CFIFO status did not change from the TRIGGERED state due to detection of
a closed gate (CFIFO in level trigger mode).
1 Entry with asserted pause bit was transferred from CFIFOn (CFIFO in edge trigger
mode), or CFIFO status changes from the TRIGGERED state due to detection of a
closed gate (CFIFO in level trigger mode).
Note: In edge trigger mode, an asserted PFn only implies that the eQADC has finished
transferring a command with an asserted pause bit from CFIFOn. It does not imply that
result data for the current command and for all previously transferred commands has been
returned to the appropriate RFIFO.
Note: In software or level trigger mode, when the eQADC completes the transfer of an
entry from CFIFOn with an asserted pause bit, PFn will not be set and transfer of
commands will continue without pausing.
3
EOQFn
End-of-queue flag n. Indicates that an entry with an asserted EOQ bit was transferred from
CFIFOn to the on-chip ADCs or to the external device. See
,” for details about command message formats. When the eQADC
completes the transfer of an entry with an asserted EOQ bit from CFIFOn, EOQFn will be
set. The transfer of entries bound for the on-chip ADCs is considered completed when they
are stored in the appropriate command buffer. The transfer of entries bound for the external
device is considered completed when the serial transmission of the entry is completed. If
the EOQIEn bit (See 19.3.2.7) and EOQFn are asserted, an interrupt will be generated.
Writing a 1 clears the EOQFn bit. Writing a 0 has no effect. Refer to
“Command Queue Completion Status
,” for more information on end-of-queue flag.
0 Entry with asserted EOQ bit was not transferred from CFIFOn
1 Entry with asserted EOQ bit was transferred from CFIFOn
Note: An asserted EOQFn only implies that the eQADC has finished transferring a
command with an asserted EOQ bit from CFIFOn. It does not imply that result data for the
current command and for all previously transferred commands has been returned to the
appropriate RFIFO.
Table 19-12. EQADC_FISRn Field Descriptions (Continued)
Bits
Name
Description
Содержание MPC5553
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