Motorola MPC533 Reference Manual page 554

Programming the QADC64E Registers
Conversion Command
Word (CCW) Table
0x200 (CCW0)
Begin Queue 1
End of Queue 1
BQ2
Begin Queue 2
End of Queue 2
0x27E (CCW63)
msb
6 7 8
P REF IST
P = Pause Until Next Trigger
REF = Use Alternate Reference Voltage
IST = Input Sample Time
CHAN = Channel Number and End_of_Queue Code
10-bit Conversion
Command Word
(CCW) Format
NOTE 1: These offsets must be added to the module base address: A = 0x30 4800
Figure 14-14. QADC64E Conversion Queue Operation
To prepare the QADC64E for a scan sequence, the software writes to the CCW table to
specify the desired channel conversions. The software also establishes the criteria for
initiating the queue execution by programming the queue operating mode. The queue
operating mode determines what type of trigger event causes queue execution to begin. A
"trigger event" is used to refer to any of the ways to cause the QADC64E to begin executing
the CCWs in a queue or sub-queue. An "external trigger" is only one of the possible "trigger
events."
A scan sequence may be initiated by the following:
• A software command
• Expiration of the periodic/interval timer
• External trigger signal
• External gated signal (queue 1 only)
14-30
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
A/D Converter
Channel Select,
Sample, Hold,
and
Analog to Digital
Conversion
lsb
9 15
CHAN
MPC533 Reference Manual
Result Word Table
msb
0
7 8
0 0 0 0 0 0
Result
Right Justified, Unsigned Result Format
0 1
7 8
0 0
S Result
Left Justified, Signed Result Format
0
7 8
Result 0 0
Left Justified, Unsigned Result Format
10-bit Result is
Software Readable
in Three Different 16-bit Formats
Result 0
Result 63
lsb
Address Offsets:
15
1
0x280-0x2FF
15
1
0x300-0x37F
0 0 0 0
S = Sign bit
15
1
0x380-0x3FF
0 0 0 0
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