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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
19-70
Freescale Semiconductor
CFIFO becomes the highest priority CFIFO using an available on-chip ADC or an external buffer that is
not full. Although command transfers will not stop upon detection of an asserted EOQ bit at the end of a
command transfer, the EOQF is asserted and, if enabled, an EOQ interrupt request is generated.
The eQADC stops transferring commands from a triggered CFIFO when CFIFO status changes from
triggered due to the detection of a closed gate. If a closed gate is detected while no command transfers are
taking place and the CFIFO status is TRIGGERED, the CFIFO status is immediately changed to waiting
for trigger and the PF flag is asserted. 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. After the transmission is completed, the TC_CF counter is updated, the PF flag is asserted, and
the CFIFO status is changed to waiting for trigger. Command transfers will restart as the gate opens.
If the gate closes and opens during the same serial transmission of a command to the external device, it
will have no effect on the CFIFO status or on the PF flag, but the TORF flag will become asserted as was
exemplified in
. Therefore, closing the gate for a period less than a serial transmission time
interval does not guarantee that the closure will affect command transfers from a CFIFO.
The pause bit has no effect in continuous-scan level-trigger mode.
19.4.3.5.4
CFIFO Scan Trigger Mode Start/Stop Summary
summarizes the start and stop conditions of command transfers from CFIFOs for all of the
single-scan and continuous-scan trigger modes.
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