MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
19-14
Freescale Semiconductor
NOTE
When disabling the eQADC SSI, the FCK will not stop until it reaches its
low phase.
19.3.2.2
eQADC Null Message Send Format Register (EQADC_NMSFR)
The EQADC_NMSFR defines the format of the null message sent to the external device.
NOTE
The eQADC null message send format register only affects how the eQADC
sends a null message, but it has no control on how the eQADC detects a null
message on receiving data. The eQADC detects a null message by decoding
the MESSAGE_TAG field on the receive data. Refer to
more information on the MESSAGE_TAG field.
NOTE
Writing to the eQADC null message send format register while serial
transmissions are enabled is not recommended (See EQADC_MCR[ESSIE]
field in Section 19.3.2.1).
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
NMF
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x0008
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
NMF
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x0008
Figure 19-3. eQADC Null Message Send Format Register (EQADC_NMSFR)
Table 19-4. EQADC_NMSFR Field Descriptions
Bits
Name
Description
0–5
—
Reserved.
6–31
NMF
[0:25]
Null message format. Contains the programmable null message send value for the
eQADC. The value written to this register will be sent as a null message when serial
transmissions from the eQADC SSI are enabled (ESSIE field is configured to 0b11 in
EQADC_MCR (Section 19.3.2.1)) and either
• there are no triggered CFIFOs with commands bound for external command buffers, or;
• there are triggered CFIFOs with commands bound for external command buffers but the
external command buffers are full.
Refer to the section “Null Message Format for External Device Operation” for more
information on the format of a null message.
Summary of Contents for MPC5553
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