Motorola MPC533 Reference Manual page 583

IDLE
Q1
IDLE
Q2
0000
QS
Situation S5 (Figure 14-28) shows that when multiple queue 2 trigger events are detected
while queue 1 is busy, the trigger overrun error bit is set, but queue 1 execution is not
disturbed. Situation S5 also shows that the effect of queue 2 trigger events during queue 1
execution is the same when the pause feature is in use in either queue.
IDLE
Q1
IDLE
Q2
0000
QS
The remaining situations, S6 through S11, show the impact of a queue 1 trigger event
occurring during queue 2 execution. Queue 1 is higher in priority the conversion taking
place in queue 2 is aborted, so that there is not a variable latency time in responding to
queue 1 trigger events.
In situation S6 (Figure 14-29), the conversion initiated by the second CCW in queue 2 is
aborted just before the conversion is complete, so that queue 1 execution can begin. Queue
MOTOROLAChapter 14. Queued Analog-to-Digital Converter Enhanced Mode Operation
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
T1
Q1:
C1 C2 C3 C4
T2
Q2:
ACTIVE
TRIGGERED
1000 1011
Figure 14-27. CCW Priority Situation 4
T1
Q1:
C1 C2
T2 T2
PF1
Q2:
C1 C2
TOR2
ACTIVE
PAUSE
TRIG
ACTIVE
1000 1011 0110
Figure 14-28. CCW Priority Situation 5
Trigger and Queue Interaction Examples
CF1
C1 C2 C3 C4
CF2
IDLE
ACTIVE
0010
T1
C3 C4
T2 T2
CF1
C3
TOR2
PF2
ACTIVE
ACTIVE
TRIG
PAUSE ACTIVE
0101 1001 1011 0010
IDLE
0000
QADC S4
C4
CF2
IDLE
IDLE
0000
QADC S5
14-59