NXP Semiconductors MPC5566, Reference Manual

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Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 19-79
After the start of command sequence transfer, the eQADC checks for the command sequence coherency
until the command sequence ends or one of the following conditions are true:
• Command sequence is non-coherent.
• CFIFO status changes from the TRIGGERED state
• CFIFO underflow occurs
NOTE
The NCF flag is asserted if an external command buffer empty event is
detected at the same time the eQADC stops checking for the coherency of a
command sequence.
After command transfers restart or continue, the non-coherency hardware operate as if the command
sequence started from that point.
Figure 19-45 depicts how the non-coherency hardware operates when a
non-coherency event is detected.
NOTE
If MODE n is changed to disabled while a CFIFO is transferring commands,
the NCF flag for that CFIFO is not asserted.
NOTE
When the eQADC enters debug or stop mode while a command sequence is
executing, the NCF asserts if an empty external command buffer is detected
after debug or stop mode exits.
Table 19-46. External Buffer Status
Capture
Point at
eQADC
Buffer Status at
External Device
Buffer Status as
Captured by the
eQADC
Used for NCF
Detection on the
eQADC?
(a) EMPTY EMPTY No change
(b) 1 ENTRY EMPTY No
(c) 2 ENTRY 1 ENTRY Yes