MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
19-73
19.4.3.6.2
Command Queue Completion Status
The end of queue flag, EQADC_FISRn[EOQF] (see Section 19.3.2.8) is asserted when the eQADC
completes the transfer of a CFIFO entry with an asserted EOQ bit. Software sets the EOQ bit in the last
command message of a user-defined command queue to indicate that this entry is the end of the queue. See
Section 19.4.1.2, “Message Format in eQADC
,” for information on command message formats. 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.
The command with a EOQ bit asserted is valid and will be transferred. When EQADC_CFCRn[EOQIE]
(see Section 19.3.2.6) and EQADC_FISRn[EOQF] are asserted, the eQADC will generate an end of queue
interrupt request.
In single-scan modes, command transfers from the corresponding CFIFO will cease when the eQADC
completes the transfer of a entry with an asserted EOQ. Software involvement is required to rearm the
CFIFO so that it can detect new trigger events.
7
TRIGGERED
(11)
IDLE
(0b00)
• CFIFO in single-scan mode, eQADC detects the EOQ bit
asserted at end of command transfer, and CFIFO mode is
not modified to disabled, OR
• CFIFO, in single-scan level trigger mode, and the gate
closes while no commands are being transferred from the
CFIFO, and CFIFO mode is not modified to disabled, OR
• CFIFO, in single-scan level trigger mode, and eQADC
detects a closed gated at end of command transfer, and
CFIFO mode is not modified to disabled, OR
• CFIFO mode is modified to disabled mode and CFIFO was
not transferring commands.
• CFIFO mode is modified to disabled mode while CFIFO was
transferring commands, and CFIFO completes or aborts the
transfer.
8
WAITING FOR
TRIGGER
(0b10)
• CFIFO in single or continuous-scan edge trigger mode,
eQADC detects the pause bit asserted at the end of
command transfer, the EOQ bit in the same command is
negated, and CFIFO mode is not modified to disabled, OR
• CFIFO in continuous-scan edge trigger mode, eQADC
detects the EOQ bit asserted at the end of command
transfer, and CFIFO mode is not modified to disabled, OR
• CFIFO, in continuous-scan level trigger mode, and the gate
closes while no commands are being transferred from the
CFIFO, and CFIFO mode is not modified to disabled, OR
• CFIFO, in continuous-scan level trigger mode, and eQADC
detects a closed gated at end of command transfer, and
CFIFO mode is not modified to disabled.
9
TRIGGERED
(0b11)
• No event to switch to IDLE or WAITING FOR TRIGGER
status has happened.
Table 19-45. Command FIFO Status Switching Condition (Continued)
No.
From Current
CFIFO Status
(CFS)
To New CFIFO
Status (CFS)
Status Switching Condition
Summary of Contents for MPC5553
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