Motorola MPC533 Reference Manual page 502

Trigger and Queue Interaction Examples
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 13-30), 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
2 is considered suspended. After queue 1 is finished, queue 2 starts over with the first CCW,
when the RES (resume) control bit is set to 0. Situation S7 (Figure 13-31) shows that when
pause operation is not in use with queue 2, queue 2 suspension works the same way.
13-58
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
T1
Q1:
C1 C2
T2 T2
PF1
Q2:
C1 C2
TOR2
ACTIVE
PAUSE
TRIG
ACTIVE
1000 1011 0110
Figure 13-29. CCW Priority Situation 5
MPC533 Reference Manual
T1
C3 C4
T2 T2
CF1
C3
TOR2
PF2
ACTIVE
ACTIVE
TRIG
PAUSE ACTIVE
0101 1001 1011 0010
C4
CF2
IDLE
IDLE
0000
QADC S5
MOTOROLA