Motorola MPC533 Reference Manual page 468

Programming the QADC64E Registers
External Gated Single-scan
External Gated Continuous-scan
One or both queues may be in the idle state. When a queue is idle, CCWs are not being
executed for that queue, the queue is not in the pause state, and there is not a trigger
pending.
The idle state occurs when a queue is disabled, when a queue is in a reserved mode, or when
a queue is in a valid queue operating mode awaiting a trigger event to initiate queue
execution.
A queue is in the active state when a valid queue operating mode is selected, when the
selected trigger event has occurred, or when the QADC64E is performing a conversion
specified by a CCW from that queue.
Only one queue can be active at a time. Either or both queues can be in the paused state. A
queue is paused when the previous CCW executed from that queue had the pause bit set.
The QADC64E does not execute any CCWs from the paused queue until a trigger event
occurs. Consequently, the QADC64E can service queue 2 while queue 1 is paused.
13-24
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Table 13-10. Pause Response (continued)
Scan Mode
Table 13-11. Queue Status
QS[9:6]
0000 queue 1 idle, queue 2 idle
0001 queue 1 idle, queue 2 paused
0010 queue 1 idle, queue 2 active
0011 queue 1 idle, queue 2 trigger pending
0100 queue 1 paused, queue 2 idle
0101 queue 1 paused, queue 2 paused
0110 queue 1 paused, queue 2 active
0111 queue 1 paused, queue 2 trigger pending
1000 queue 1 active, queue 2 idle
1001 queue 1 active, queue 2 paused
1010 queue 1 active, queue 2 suspended
1011 queue 1 active, queue 2 trigger pending
1100 Reserved
1101 Reserved
1110 Reserved
1111 Reserved
MPC533 Reference Manual
Q Operation
Continues
Continues
Queue 1/Queue 2 States
PF Asserts?
No
No
MOTOROLA