Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
18-52
Freescale Semiconductor
Read Configuration Command Message Format for On-Chip ADC Operation
describes the command message format for a read configuration command when interfacing
with the on-chip ADCs. A read configuration command is used to read the contents of the on-chip ADC
registers which are only accessible via command messages. Read configuration commands are
differentiated from write configuration commands by an asserted R/W bit.
5
EB
External buffer bit. This bit should always be cleared for messages sent to an on-chip ADC.
0 Command is sent to an internal command buffer.
1 Command is sent to an external command buffer.
6
BN
Buffer number. Indicates in which buffer the message is stored. Buffers 1 and 0 can either be internal or external
depending on the EB bit setting.
0 Message stored in buffer 0.
1 Message stored in buffer 1.
7
R/W
Read/write. A negated R/W indicates a write configuration command.
0 Write
1 Read
8–15
ADC_
REGISTER
_HIGH_
BYTE[0:7]
ADC register high byte. The value to be written into the most significant 8 bits of control/configuration register
when the R/W bit is negated.
16–23
ADC_
REGISTER
_LOW_
BYTE[0:7]
ADC register low byte. The value to be written into the least significant 8 bits of a control/configuration register
when the R/W bit is negated.
24–31
ADC_REG_
ADDRESS
[0:7]
ADC register address. Selects a register on the ADC register set to be written or read. Only halfword addresses
can be used. Refer to
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
EOQ
PAUSE
Reserved
EB
(0b0)
BN
R/W
(0b1)
MESSAGE_TAG
Reserved
CFIFO Header
ADC Command
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Reserved
ADC_REG_ADDRESS
ADC Command
Figure 18-28. Read Configuration Command Message Format for On-Chip ADC Operation
Table 18-35. On-Chip ADC Field Descriptions: Write Configuration
Field
Description
Содержание MPC5565
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