Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
18-57
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
EOQ
PAUSE
Reserved
ABORT
_ST
EB
(0b1)
BN
OFF_CHIP_COMMAND
CFIFO Header
ADC Command
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
OFF_CHIP_COMMAND
ADC Command
Figure 18-31. Command Message Format for External Device Operation
Table 18-40. On-Chip ADC Field Descriptions: External Device Operation
Field
Description
0
EOQ
End-of-queue. Asserted in the last command of a command queue to indicate to the eQADC that a scan of the
queue is completed. EOQ instructs the eQADC to reset its current CFIFO transfer counter value (TC_CF) to 0.
Depending on the CFIFO mode of operation, the CFIFO status changes upon the detection of an asserted EOQ
bit on the last transferred command. Refer to
Section 18.4.3.5, “CFIFO Scan Trigger Modes
,” for details.
0 Not the last entry of the command queue.
1 Last entry of the command queue.
Note:
If both the pause and EOQ bits are asserted in the same command message the respective flags are set,
but the CFIFO status changes as if only the EOQ bit were asserted.
1
PAUSE
Pause bit. Allows software to create sub-queues within a command queue. When the eQADC completes the
transfer of a command with an asserted pause bit, the CFIFO enters the WAITING FOR TRIGGER state. Refer
to
Section 18.4.3.6.1, “CFIFO Operation Status
,” for a description of the state transitions. The pause bit is only
valid when CFIFO operation mode is configured to single or continuous-scan edge trigger mode.
0 Do not enter WAITING FOR TRIGGER state after transfer of the current command message.
1 Enter WAITING FOR TRIGGER state after transfer of the current command message.
Note:
If both the pause and EOQ bits are asserted in the same command message the respective flags are set,
but the CFIFO status changes as if only the EOQ bit were asserted.
2–3
Reserved.
4
ABORT
_ST
ABORT serial transmission. Indicates whether an on-going serial transmission should be aborted or not. All
CFIFOs can abort null message transmissions when triggered but only CFIFO0 can abort command
transmissions of lower priority CFIFOs. For more on serial transmission aborts see
Prioritization and Command Transfer
.”
0 Do not abort current serial transmission.
1 Abort current serial transmission.
5
EB
External buffer. This bit should always be set for messages sent to an external ADC.
0 Command is sent to an internal command buffer.
1 Command is sent to an external command buffer.
6
BN
Refer to
Section , “Conversion Command Message Format for On-Chip ADC Operation
.”
7–31
OFF_CHIP_
COMMAND
[0:24]
OFF-CHIP COMMAND Field. The OFF_CHIP_COMMAND field can be anything decodable by the external
device. It is 25 bits long and it is transferred together with the BN bit to the external device when the CFIFO is
triggered. Refer to
Section , “Conversion Command Message Format for On-Chip ADC Operation
,” for a
description of the command message used when interfacing with the on-chip ADCs.
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