Motorola MPC533 Reference Manual page 530

Key Features, Overview and Quick Reference Diagrams
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 14-2. CCW Queue and Result Table Block Diagram
14.2.5 External Multiplexing
The QADC can use from one to four 8-input external multiplexer chips to expand the
number of analog signals that may be converted. The externally multiplexed channels are
automatically selected from the channel field of the conversion command word (CCW)
table. External Multiplex mode is software selectable, by setting the EMUX bit of control
register 0 (QACR0).
Figure 14-3 shows the maximum configuration of four external multiplexer chips
connected to the QADC. The QADC provides three multiplexer address signals – MA[0],
MA[1], MA[2] – to select one of the multiplexer chips. These outputs are the multiplexer
control lines and they are connected to all external multiplexer chips.
14-6
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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