QADC64E Enhanced Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
14-54
Freescale Semiconductor
When a trigger event causes a CCW execution in progress to be aborted, the aborted conversion is shown
as a ragged end of a shortened CCW rectangle.
The situation diagrams also show when key status bits are set.
describes the status bits.
Below the queue execution flows are three sets of blocks that show the status information that is made
available to the software. The first two rows of status blocks show the condition of each queue as:
•
Idle
•
Active
•
Pause
•
Suspended (queue 2 only)
•
Trigger pending
The third row of status blocks shows the 4-bit QS status register field that encodes the condition of the two
queues. Two transition status cases, QS = 0011 and QS = 0111, are not shown because they exist only very
briefly between stable status conditions.
The first three examples in
(S1, S2, and S3) show what happens when
a new trigger event is recognized before the queue has completed servicing the previous trigger event on
the same queue.
In situation S1 (
), one trigger event is being recognized on each queue while that queue is still
working on the previously recognized trigger event. The trigger overrun error status bit is set, and
otherwise, the premature trigger event is ignored. A trigger event which occurs before the servicing of the
previous trigger event is through does not disturb the queue execution in progress.
Table 14-24. Status Bits
Bit
Function
CF Flag
Set when the end of the queue is reached
PF Flag
Set when a queue completes execution up through a pause bit
Trigger Overrun
Error (TOR)
Set when a new trigger event occurs before the queue is finished
serving the previous trigger event
Summary of Contents for MPC561
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Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
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Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
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