MMC2107 Datasheet, PDF (461/618 Pages) –

Freescale Semiconductor, Inc.
Queued Analog-to-Digital Converter (QADC)
Digital Control
Situations S10 and S11 (Figure 18-32 and Figure 18-33) 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 permits the software to know that queue 1 is taking up
so much QADC time that queue 2 trigger events are being lost.
T1
Q1: C1 C2
T1
C3 C4
T2
T2
PF1
T2
T2
CF1
Q2: _{C1 C2}
C1 C2
C3
C3 C4
RESUME = 0
TOR2
PF2
TOR2
CF2
Q1
IDLE
ACTIVE
PAUSE
ACTIVE
IDLE
Q2
IDLE
ACTIVE
SUSPEND
ACTIVE PAUSE ACT SUSPEND
ACTIVE
IDLE
QS
0000
0010
1010
0110
0101 0110
1010
0010
0000
Figure 18-32. CCW Priority Situation 10
T1
T1
Q1: C1 C2
C3 C4
T2
T2
Q2: _{C1 C2}
PF1
C2
T2
T2
C3 C4
CF1
C4
RESUME = 1
TOR2
PF2
TOR2
CF2
Q1
IDLE
ACTIVE
PAUSE
ACTIVE
IDLE
Q2
IDLE
ACTIVE
SUSPEND ACT PAUSE ACTIVE
SUSPEND ACT
IDLE
QS
0000
0010
1010
0110 0101
0110
1010
0010
0000
Figure 18-33. CCW Priority Situation 11
MMC2107 – Rev. 2.0
MOTOROLA
Queued Analog-to-Digital Converter (QADC)
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Technical Data
461