Motorola MPC533 Reference Manual page 582

Trigger and Queue Interaction Examples
T1 T1 T1
C1 C2 C3
Q1:
TOR1 TOR1
IDLE
ACTIVE
Q1
Q2
1000
QS
Situation S3 (Figure 14-25) shows that when the pause feature is in use, the trigger overrun
error status bit is set the same way, and that queue execution continues unchanged.
T1 T1
C1
Q1:
TOR1
IDLE
Q1 ACTIVE
IDLE
Q2
QS
0000 1000
The next two situations consider trigger events that occur for the lower priority queue 2,
while queue 1 is actively being serviced.
Situation S4 (Figure 14-27) shows that a queue 2 trigger event that is recognized while
queue 1 is active is saved, and as soon as queue 1 is finished, queue 2 servicing begins.
14-58
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
T1 T1
C4 C1 C2
TOR1
CF1
IDLE
ACTIVE
IDLE
1000
Figure 14-25. CCW Priority Situation 2
C2
PF1 T2 T2
Q2:
C1 C2
TOR2 PF2
PAUSE
ACTIVE
0100 0110
Figure 14-26. CCW Priority Situation 3
MPC533 Reference Manual
C3 C4
T2
CF1
Q2:
0000
T1 T1
C3 C4
TOR1 CF1
ACTIVE
PAUSE
0101 1001 0001
T2 T2
C1 C2 C3 C4
TOR2 TOR2 CF2
IDLE
IDLE
ACTIVE
0010 0000
T2 T2
C3 C4
CF2
TOR2
IDLE
ACTIVE IDLE
0010 0000
QADC S3
MOTOROLA
QADC S2