MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
19-59
19.4.2
Command/Result Queues
The command and result queues are actually part of the eQADC system although they are not hardware
implemented inside the eQADC. Instead command and result queues are user-defined queues located in
system memory. Each command queue entry is a 32-bit command message.The last entry of a command
queue has the EOQ bit asserted to indicate that it is the last entry of the queue. The result queue entry is a
16-bit data item.
See
Section 19.1.4, “Modes of Operation
for a description of the message formats and their flow in
eQADC.
Refer to
Section 19.5.5, “Command Queue and Result Queue Usage
,” for examples of how command
queues and result queues can be used.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CONTENTS OF EQADC_NMSFR REGISTER
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
CONTENTS OF EQADC_NMSFR REGISTER
Figure 19-33. Null Message Send Format for External Device Operation
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Reserved
MESSAGE_TAG
(0b1000)
BUSY1
BUSY0
RFIFO Header
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
DETERMINED BY THE EXTERNAL DEVICE
ADC Result
Figure 19-34. Null Message Receive Format for External Device Operation
Table 19-43. Null Message Receive 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
.”
12–15
BUSYn
[0:1]
BUSY status. Refer to
Section , “ Result Message Format for External Device Operation
.”
16–31
—
Determined by the external device.
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