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Programming the QADC64E Registers
2 CCW entry. The RESUME bit in QACR2 allows the software to select where
queue 2 begins after suspension. By choosing to re-execute all of the suspended
queue 2 queue and sub-queue CCWs, all of the samples are guaranteed to have been
taken during the same scan pass. However, a high trigger event rate for queue 1 can
prohibit the completion of queue 2. If this occurs, the software may choose to begin
execution of queue 2 with the aborted CCW entry.
• Software can change the queue operating mode to disabled mode. Any conversion
in progress for that queue is aborted. Putting a queue into the disabled mode does
not power down the converter.
• Software can change the queue operating mode to another valid mode. Any
conversion in progress for that queue is aborted. The queue restarts at the beginning
of the queue, once an appropriate trigger event occurs.
• For low power operation, software can set the stop mode bit to prepare the module
for a loss of clocks. The QADC64E aborts any conversion in progress when the stop
mode is entered.
• When the freeze enable bit is set by software and the IMB3 internal FREEZE line is
asserted, the QADC64E freezes at the end of the conversion in progress. When
internal FREEZE is negated, the QADC64E resumes queue execution beginning
with the next CCW entry. Refer to Section 14.5.7, "Configuration And Control
Using the IMB3 Interface" for more information.
MSB
1
0
Field
SRESET
Addr
Figure 14-15. Conversion Command Word Table (CCW)
Bits
Name
0:5
—
6
P
7
REF
14-32
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
2
3
4
5
—
0x30 4A00 – 0x30 4A7F, 0x30 4E00 – 0x30 4E7F
Table 14-17. CCW Bit Descriptions
Reserved
Pause — The pause bit allows software to create sub-queues within queue 1 and queue 2.
The QADC64E performs the conversion specified by the CCW with the pause bit set, and
then the queue enters the pause state. Another trigger event causes execution to continue
from the pause to the next CCW.
0 Do not enter the pause state after execution of the current CCW
1 Enter the pause state after execution of the current CCW
NOTE: The pause bit will not cause the queue to pause in the software controlled modes
or external gated modes.
Alternate Reference Enabled — Setting REF high in the CCW enables the use of an
alternate reference.
0 VRH is used as high reference
1 AltRef signal is used as the high reference
MPC533 Reference Manual
6
7
8
9
P
REF
IST
Unaffected
Description
10
11
12
13
CHAN[5:0]
MOTOROLA
14
LSB
15
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