Figure 28-25, Situation s3 – Motorola ColdFire MCF5281 User Manual
Page 577

Queued Analog-to-Digital Converter (QADC)
Freescale Semiconductor
28-39
Figure 28-25. CCW Priority Situation 3
The next two situations consider trigger events that occur for the lower priority queue 2, while queue 1 is
actively being serviced.
Situation S4 (
) shows that a queue 2 trigger event is recognized while queue 1 is active is
saved, and as soon as queue 1 is finished, queue 2 servicing begins.
Figure 28-26. CCW Priority Situation 4
) 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
used for either queue.
PAUSE
Q1:
Q2:
QS:
IDLE
ACTIVE
IDLE
ACTIVE
IDLE
1000
0110
0001
0010
ACTIVE
0000
IDLE
C1
C2
T1
T1
Q1:
TOR1
PF1
C1
C2
0000
Q2:
0100
TOR2
PF2
T2
T2
0101
C3
C4
T1
T1
TOR1
CF1
ACTIVE
PAUSE
1001
C3
C4
CF2
T2
T2
TOR2
Q1:
Q2:
QS:
IDLE
IDLE
ACTIVE
IDLE
0000
1000
0010
ACTIVE
0000
C1
C2
C3
C4
T1
Q1:
CF1
Q2:
C1
C2
C3
C4
T2
CF2
IDLE
1011
TRIGGERED
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3