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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
19-65
2. CFIFO1-5 commands are only scheduled for the next transmission if the previously scheduled
data was a null message. The time during which SDS is negated is stretched in order to allow the
eQADC to load that command and start its transmission. However, if the previously scheduled
data was a command, no rescheduling occurs and the next transmission starts without delays.
If a CFIFO becomes triggered while SDS is negated, but the eQADC only attempts to reschedule that
CFIFO command after SDS is asserted, then the current transmission is aborted depending on if the
conditions for that are met or not.
Figure 19-37. CFIFO Prioritization Logic
19.4.3.3
External Trigger from eTPU or eMIOS Channels
The six eQADC external trigger inputs can be connected to either an external pin, an eTPU channel, or an
eMIOS channel. The input source for each eQADC external trigger is individually specified in the eQADC
trigger input select register (SIU_ETISR) in the SIU block.
The eQADC trigger numbers specified by SIU_ETISR[TSEL(0-5)] correspond to CFIFO numbers 0-5. To
calculate the CFIFO number that each trigger is connected to, divide the eDMA channel number by 2.
ADC0
Command Buffer0
(2 Entries)
eQADC
Prioritization
Logic
Prioritization
for ADC0
Usage
Command
6 x Command
Command
CFIFO0
Command
CFIFO1
Command
CFIFO2
Command
CFIFO3
Command
CFIFO4
Command
CFIFO5
ADC1
Command Buffer1
(2 Entries)
Prioritization
for ADC1
Usage
Command
EQADC SSI
Transmit Buffer
Prioritization
for EQADC
SSI Usage
Command
(1 Entry)
eQADC SSI
Serial Link
External Device
SSI Interface
Command Buffer2
ADC2
Command
Command Buffer3
ADC3
Command
External
Device
Summary of Contents for MPC5553
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