Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
18-15
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
for
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. Refer to
EQADC_MCR[ESSIE] field in
Section 18.3.2.1, “eQADC Module
Configuration Register (EQADC_MCR)
18.3.2.3
eQADC External Trigger Digital Filter Register (EQADC_ETDFR)
The EQADC_ETDFR is used to set the minimum time a signal must be held in a logic state on the CFIFO
triggers inputs to be recognized as an edge or level gated trigger. The digital filter length field specifies the
Address: Base + 0x008
Access: Read/Write
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
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
Figure 18-3. eQADC Null Message Send Format Register (EQADC_NMSFR)
Table 18-4. EQADC_NMSFR Field Descriptions
Field
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 is sent as a null message when serial transmissions from the eQADC SSI are enabled (ESSIE field is
configured to 0b11 in EQADC_MCR (
Section 18.3.2.1, “eQADC Module Configuration Register (EQADC_MCR)
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
Section , “Null Message Format for External Device Operation
” for more information on the format of a null
message.
Summary of Contents for MPC5565
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