MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
19-24
Freescale Semiconductor
4
CFUFn
CFIFO underflow flag n. Indicates an underflow event on CFIFOn. CFUFn is set when
CFIFOn is in the TRIGGERED state and it becomes empty. No commands will be
transferred from an underflowing CFIFO, nor will command transfers from lower priority
CFIFOs be blocked. When CFUIEn (see Section 19.3.2.7) and CFUFn are both asserted,
the eQADC generates an interrupt request.
Apart from generating an independent interrupt request for a CFIFOn underflow event, the
eQADC also provides a combined interrupt at which the result FIFO overflow interrupt, the
command FIFO underflow interrupt, and the command FIFO trigger overrun interrupt
requests of all CFIFOs are ORed. When RFOIEn, CFUIEn, and TORIEn are all asserted,
this combined interrupt request is asserted whenever one of the following 18 flags
becomes asserted: RFOFn, CFUFn, and TORFn (assuming that all interrupts are
enabled). See
Section 19.4.7, “eQADC eDMA/Interrupt Request
,” for details. Writing a 1
clears CFUFn. Writing a 0 has no effect.
0 No CFIFO underflow event occurred
1 A CFIFO underflow event occurred
5
SSSn
CFIFO single-scan status bit n. When asserted, enables the detection of trigger events for
CFIFOs programmed into single-scan level- or edge-trigger mode, and works as trigger for
CFIFOs programmed into single-scan software-trigger mode. Refer to
,” for further details. The SSSn bit is set by writing a 1 to the SSEn bit
(see Section 19.3.2.6). The eQADC clears the SSSn bit when a command with an asserted
EOQ bit is transferred from a CFIFO in single-scan mode, when a CFIFO is in single-scan
level-trigger mode and its status changes from the TRIGGERED state due to the detection
of a closed gate, or when the value of the CFIFO operation mode MODEn (see Section
19.3.2.6) is changed to disabled. Writing to SSSn has no effect. SSSn has no effect in
continuous-scan or in disabled mode.
0 CFIFO in single-scan level- or edge-trigger mode will ignore trigger events, or CFIFO in
single-scan software-trigger mode is not triggered.
1 CFIFO in single-scan level- or edge-trigger mode will detect a trigger event, or CFIFO in
single-scan software-trigger mode is triggered.
6
CFFFn
CFIFO fill flag n. CFFFn is set when the CFIFOn is not full. When CFFEn (see Section
19.3.2.7) and CFFFn are both asserted, an interrupt or an eDMA request will be generated
depending on the status of the CFFSn bit. When CFFSn is negated (interrupt requests
selected), software clears CFFFn by writing a 1 to it. Writing a 0 has no effect. When
CFFSn is asserted (eDMA requests selected), CFFFn is automatically cleared by the
eQADC when the CFIFO becomes full.
0 CFIFOn is full.
1 CFIFOn is not full.
Note: When generation of interrupt requests is selected (CFFSn=0), CFFFn must only be
cleared in the ISR after the CFIFOn push register is accessed.
Note: CFFFn should not be cleared when CFFSn is asserted (eDMA requests selected).
7–11
—
Reserved.
Table 19-12. EQADC_FISRn Field Descriptions (Continued)
Bits
Name
Description
Summary of Contents for MPC5553
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