MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
19-48 Freescale Semiconductor
Table 19-34. On-Chip ADC Field Descriptions:
Conversion Command Message Format
Bits Name Description
0 EOQ End-of-queue. Asserted in the last command of a command queue to indicate to the
eQADC that a scan of the queue is completed. EOQ instructs the eQADC to reset its
current CFIFO transfer counter value (TC_CF) to 0. Depending on the CFIFO mode of
operation, the CFIFO status will also change upon the detection of an asserted EOQ bit on
the last transferred command. See Section 19.4.3.5, “CFIFO Scan Trigger Modes,” for
details.
0 Not the last entry of the command queue.
1 Last entry of the command queue.
Note: If both the pause and EOQ bits are asserted in the same command message the
respective flags are set, but the CFIFO status changes as if only the EOQ bit were
asserted.
1 PAUSE Pause. Allows software to create sub-queues within a command queue. When the eQADC
completes the transfer of a command with an asserted pause bit, the CFIFO enters the
WAITING FOR TRIGGER state. Refer to Section 19.4.3.6.1, “CFIFO Operation Status,” for
a description of the state transitions. The pause bit is only valid when CFIFO operation
mode is configured to single or continuous-scan edge trigger mode.
0 Do not enter WAITING FOR TRIGGER state after transfer of the current command
message.
1 Enter WAITING FOR TRIGGER state after transfer of the current command message.
Note: If both the pause and EOQ bits are asserted in the same command message the
respective flags are set, but the CFIFO status changes as if only the EOQ bit were
asserted.
2–4 — Reserved.
5 EB External buffer bit. A negated EB bit indicates that the command is sent to an on chip ADC.
0 Command is sent to an internal buffer.
1 Command is sent to an external buffer.
6 BN Buffer number. Indicates which ADC the message will be sent to. ADCs 1 and 0 can either
be internal or external depending on the EB bit setting.
0 Message sent to ADC 0.
1 Message sent to ADC 1.
7 CAL Calibration. Indicates if the returning conversion result must be calibrated.
0 Do not calibrate conversion result.
1 Calibrate conversion result.
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