Ccw Priority Situation 10; Ccw Priority Situation 11 - Motorola ColdFire MCF5281 User Manual

Digital Control Subsystem
T2
Q2:
C1
IDLE
Q1:
IDLE
ACTIVE
Q2:
QS:
0000 0010
T2
Q2:
C1
IDLE
Q1:
IDLE
ACTIVE
Q2:
QS:
0000 0010
The previous situations cover normal overlap conditions that arise with asynchronous
trigger events on the two queues. An additional conflict to consider is that the freeze
condition can arise while the QADC is actively executing CCWs. The conventional use for
the debug mode is for software/hardware debugging. When the CPU enters background
debug mode, peripheral modules can cease operation. When freeze is detected, the QADC
completes the conversion in progress, unlike the abort that occurs when queue 1 suspends
queue 2. After the freeze condition is removed, the QADC continues queue execution with
the next CCW in sequence.
Trigger events that occur during freeze are not captured. When a trigger event is pending
for queue 2 before freeze begins, that trigger event is remembered when the freeze is
27-46
T1
Q1: C1 C2
T2 PF1
C1 C2
C2
TOR2
ACTIVE PAUSE
SUSPEND ACTIVE
1010 0110
Figure 27-32. CCW Priority Situation 10
T1
Q1: C1 C2
T2 PF1
C2
C2
TOR2 PF2
ACTIVE PAUSE
SUSPEND ACT PAUSE
0101
1010 0110
Figure 27-33. CCW Priority Situation 11
MCF5282 User's Manual
T1
C3 C4
T2 T2 CF1
C3
PF2 TOR2
ACTIVE
PAUSE ACT SUSPEND
0101 0110 1010
T1
C3 C4
T2 T2 CF1
C3
C4
TOR2
ACTIVE
SUSPEND
ACTIVE
0110 1010
C3 C4
RESUME = 0
CF2
IDLE
IDLE
ACTIVE
0010 0000
RESUME = 1
C4
CF2
IDLE
IDLE
ACT
0010 0000
MOTOROLA