NXP Semiconductors MPC5644A, Reference Manual, Page: 1082 / 1735

Enhanced Queued Analog-to-Digital Converter (EQADC)
MPC5644A Microcontroller Reference Manual, Rev. 6
1082 Freescale Semiconductor
ADC Result Format for On-Chip ADC Operation
When the FIFO Control Unit receives a return data message, it decodes the MESSAGE_TAG field and
stores the 16-bit data into the appropriate RFIFO. This section describes the ADC result portion of the
result message returned by the on-chip ADCs. The 16-bit data stored in the RFIFOs can be:
• Data read from an ADC register with a read configuration command. In this case, the stored 16-bit
data corresponds to the contents of the ADC register that was read.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
EOQ
PAU
SE
REP
RESERVE
D
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 25-53. Read Configuration Command Format for On-Chip ADC Operation
Table 25-56. Read Configuration Command Format for On-Chip ADC Operation field description
Field Description
0
EOQ
End Of Queue Bit
1
PAUSE
Pause Bit
2
REP
Repeat/loop Start Point Indication Bit
5
EB
External Buffer Bit
6
BN
Buffer Number Bit
Refer to
Section , Conversion Command Format for the Standard Configuration ..
7
R/W
R/W - Read/Write bit
An asserted R/W bit indicates a read configuration command.
1 Read
8-11
MESSAGE_TAG
[0:3]
MESSAGE_TAG Field
Refer to
Section , Conversion Command Format for the Standard Configuration ..
24-31
ADC_REG_ADDRESS
[0:7]
ADC Register Address
The ADC_REG_ADDRESS field selects a register on the ADC register set to be written
or read. Only half-word addresses can be used.