Motorola ColdFire MCF5281 - Manual (Page 580)

Queued Analog-to-Digital Converter (QADC)
28-42 Freescale Semiconductor
Figure 28-31. CCW Priority Situation 9
Situations S10 and S11 ( Figure 28-32 and Figure 28-33 ) show that when an additional trigger event is
detected for queue 2 while the queue is suspended, the trigger overrun error bit is set, the same as if queue
2 were being executed when a new trigger event occurs. Trigger overrun on queue 2 thus allows the user
to know that queue 1 is taking up so much QADC time that queue 2 trigger events are being lost.
Figure 28-32. CCW Priority Situation 10
T1
PAUSE Q1:
Q2:
QS:
IDLE ACTIVE
IDLE ACT IDLE
0010 0110 1010 0010
ACTIVE
0000
IDLE
Q1:
PF1
C1 C2
0000 1010 0101
ACTIVE
PAUSE
0110
C1 Q2:
T2
C2
PF2
T1
C3 C4
CF1
C4
CF2
SUSPEND ACT ACTIVE SUSPEND
T2
C3 C1 RESUME=1 C2 C4
T1 T1
PAUSE Q1:
Q2:
QS:
IDLE ACTIVE
IDLE ACTIVE IDLE
0010 0110 1010 0010
ACTIVE
0000
IDLE
Q1:
PF1
C1 C2
0000 1010 0101
ACTIVE
PAUSE
0110
Q2:
T2
PF2
C1 C2
C3 C4
CF1
C3 C4
CF2
T2
C3
SUSPEND ACTIVE
C1
ACT SUSPEND
T2
TOR2
T2
TOR2
RESUME = 0
C2
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3