QADC64E Legacy Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
13-61
Figure 13-37. CCW Priority Situation 11
The above situations cover normal overlap conditions that arise with asynchronous trigger events on the
two queues. An additional conflict to consider is that the freeze condition can arise while the QADC64E
is actively executing CCWs. The conventional use for the freeze mode is for software/hardware
debugging. When the CPU background debug mode is enabled and a breakpoint occurs, the freeze signal
is issued, which can cause peripheral modules to stop operation. When freeze is detected, the QADC64E
completes the conversion in progress, unlike queue 1 suspending queue 2. After the freeze condition is
removed, the QADC64E continues queue execution with the next CCW in sequence.
Trigger events that occur during freeze are not captured. When a trigger event is pending for queue 2 before
freeze begins, that trigger event is remembered when the freeze is passed. Similarly, when freeze occurs
while queue 2 is suspended, after freeze, queue 2 resumes execution as soon as queue 1 is finished.
Situations 12 through 19 (
) show examples of all of the freeze situations.
Figure 13-38. CCW Freeze Situation 12
QADC S11
T1
T1
C3
C4
CF1
PAUSE
Q1
Q2
QS
IDLE
IDLE
ACT
IDLE
0010
0110
1010
0010
ACTIVE
0000
IDLE
Q1:
PF1
C1
C2
0000
1010
0101
ACTIVE
PAUSE
0110
Q2:
T2
SUSPEND
ACT
C1
ACTIVE
SUSPEND
T2
TOR2
T2
TOR2
C2
PF2
C4
CF2
T2
C3
C2
C4
RESUME=1
ACTIVE
QADC S12
C3
C4
CF1
C1
C2
T1
Q1:
FREEZE
Summary of Contents for MPC561
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