MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
19-50 Freescale Semiconductor
Write Configuration Command Message Format for On-Chip ADC Operation
Figure 19-27 describes the command message format for a write configuration command when interfacing
with the on-chip ADCs. A write configuration command is used to set the control registers of the on-chip
ADCs. No conversion data will be returned for a write configuration command. Write configuration
commands are differentiated from read configuration commands by a negated R/W bit.
15 FMT Conversion data format. FMT specifies to the eQADC how to format the 12-bit conversion
data returned by the ADCs into the 16-bit format which is sent to the RFIFOs. See Section ,
“ ADC Result Format for On-Chip ADC Operation,” for details.
0 Right justified unsigned.
1 Right justified signed.
16–23 CHANNEL_
NUMBER
[0:7]
Channel number. Selects the analog input channel. The software programs this field with
the channel number corresponding to the analog input pin to be sampled and converted.
See Section 19.4.6.1, “Channel Assignment,” for details.
24–31 — Reserved.
0 1 23456789101112131415
EOQ PAUSE Reserved EB
(0b0)
BN R/W
(0b0)
ADC_REGISTER HIGH BYTE
CFIFO Header ADC Command
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
ADC_REGISTER LOW BYTE ADC_REG_ADDRESS
ADC Command
Figure 19-27. Write Configuration Command Message Format for
On-chip ADC Operation
Table 19-34. On-Chip ADC Field Descriptions:
Conversion Command Message Format (Continued)
Bits Name Description
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