MMC2107 Datasheet, PDF (431/618 Pages) –

Freescale Semiconductor, Inc.
Queued Analog-to-Digital Converter (QADC)
Register Descriptions
PF2 is maintained by the QADC regardless of whether the
corresponding interrupts are enabled. The software may poll PF2 to
find out when the QADC has reached a pause in scanning a queue.
The software acknowledges that it has detected a pause flag being
set by writing a 0 to PF2 after the bit was last read as a 1.
1 = queue 2 has reached a pause.
0 = queue 2 has not reached a pause.
See Table 18-7 for a summary of pause response in all scan modes.
TOR1 — Queue 1 Trigger Overrun
TOR1 indicates that an unexpected trigger event has occurred for
queue 1. TOR1 can be set only while queue 1 is in the active state.
A trigger event generated by a transition on the external trigger pin or
by the periodic/interval timer may be captured as a trigger overrun.
TOR1 cannot occur when the software-initiated single-scan mode or
the software-initiated continuous-scan mode are selected.
TOR1 occurs when a trigger event is received while a queue is
executing and before the scan has completed or paused. TOR1 has
no effect on the queue execution.
After a trigger event has occurred for queue 1, and before the scan
has completed or paused, additional queue 1 trigger events are not
retained. Such trigger events are considered unexpected, and the
QADC sets the TOR1 error status bit. An unexpected trigger event
may be a system overrun situation, indicating a system loading
mismatch.
In external gated continuous-scan mode, the definition of TOR1 has
been redefined. In the case when queue 1 reaches an end-of-queue
condition for the second time during an open gate, TOR1 becomes
set. This is considered an overrun condition. In this case CF1 has
been set for the first end-of-queue 1 condition and then TOR1
becomes set for the second end-of-queue 1 condition. For TOR1
to be set, software must not clear CF1 before the second
end-of-queue 1.
MMC2107 – Rev. 2.0
MOTOROLA
Queued Analog-to-Digital Converter (QADC)
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Technical Data
431