MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
19-57
Result Message Format for External Device Operation
Data is returned from the ADCs in the form of result messages. A result message is composed of an RFIFO
header and an ADC result. The FIFO control unit decodes the information contained in the RFIFO header
and sends the contents of the ADC result to the appropriate RFIFO. Only data stored on the
ADC_RESULT field is stored in the RFIFOs/result queues. The ADC result of any received message with
a null data message tag will be ignored. The format of a result message returned from the external device
is shown in
. It is 26 bits long, and is composed of a MESSAGE_TAG field, information
about the status of the buffers (BUSY fields), and result data. The BUSY fields are needed to inform the
eQADC about when it is appropriate to transfer commands to the external command buffers.
6
BN
Refer to
Section , “ Conversion Command Message Format for On-Chip ADC
.”
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
“ Conversion Command Message Format for On-Chip ADC Operation
,” for a
description of the command message used when interfacing with the on-chip ADCs.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Reserved
MESSAGE_TAG
BUSY1
BUSY0
RFIFO Header
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
ADC_RESULT
ADC Result
Figure 19-32. Result Message Format for External Device Operation
Table 19-41. Result Message Format for External Device Operation
Bits
Name
Description
6–7
—
Reserved.
8–11
MESSAGE_TAG
[0:3]
MESSAGE_TAG Field. Refer to
Section , “ Conversion Command Message Format for
.”
Table 19-40. On-Chip ADC Field Descriptions: External Device Operation (Continued)
Bits
Name
Description
Summary of Contents for MPC5553
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