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Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
19-77
•
The CFIFO is constantly transferring commands and the previous command sequence ended.
•
The CFIFO resumes command transfers after being interrupted.
And a command sequence ended when:
•
An asserted EOQ bit is detected on the last transferred command.
•
CFIFO is in edge-trigger mode and asserted pause bit is detected on the last transferred command.
•
The ADC to which the next command is sent is different from the ADC command last transferred.
shows examples of how the eQADC would detect command sequences when transferring
commands from a CFIFO. The smallest possible command sequence can have a single command as shown
in example 3 of
.
Figure 19-41. Command Sequence Examples
The eQADC checks for non-coherency of seven command
sequences, all containing a single command, but NCF is never set.
CF
n
_ADCa_CMD
n
– Command
n
in CFIFO
n
bound for ADCa
(ADC3 and ADC4 are external devices associated with external
command buffers 2 and 3).
Assuming that these commands are transferred by a CFIFO
configured for edge trigger mode and the command transfers are
never interrupted, the eQADC checks for non-coherency of two
command sequences: one formed by commands 0, 1, 2, 3, and the
other by commands 4, 5, 6.
Assuming that command transfers from the CFIFO are never
interrupted, the eQADC checks for non-coherency of three
command sequences. The first being formed by commands 0, 1, 2,
the second by commands 3, 4 and the third by commands 5, 6.
Even when the commands of this queue are transferred through a
CFIFO in continuous-scan mode, the first three commands and the
last two commands of this command queue still constitute two
distinct command sequences, although they are all bound for the
same ADC, because an asserted EOQ ends a command
sequence.
User Command Queue with
Two Command Sequences
CF5_ADC1_CM6(EOQ=1)
7
CF5_ADC1_CM5
6
CF5_ADC1_CM4
5
CF5_ADC1_CM3(Pause=1)
4
CF5_ADC1_CM2
3
CF5_ADC1_CM1
2
CF5_ADC1_CM0
1
Example 1
User Command Queue with
Three Command Sequences
CF5_ADC1_CM6(EOQ=1)
7
CF5_ADC1_CM5
6
CF5_ADC0_CM4
5
CF5_ADC0_CM3
4
CF5_ADC1_CM2
3
CF5_ADC1_CM1
2
CF5_ADC1_CM0
1
Example 2
User Command Queue with a
Seven Command Sequence
CF5_ADC1_CM6(EOQ=1)
7
CF5_ADC2_CM5
6
CF5_ADC0_CM4
5
CF5_ADC1_CM3
4
CF5_ADC3_CM2
3
CF5_ADC2_CM1
2
CF5_ADC1_CM0
1
Example 3
Содержание MPC5566
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