MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
Queued Analog-to-Digital Converter (QADC)
The software acknowledges that it has detected a trigger overrun
being set by writing a 0 to the trigger overrun, after the bit was read
as a 1. Once set, only software or reset can clear TOR1.
1 = At least one unexpected queue 1 trigger event has occurred or
queue 1 reaches an end-of-queue condition for the second
time in gated mode
0 = No unexpected queue 1 trigger events have occurred
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Freescale Semiconductor, I
TOR2 — Queue 2 Trigger Overrun Flag
TOR2 indicates that an unexpected trigger event has occurred for
queue 2. TOR2 can be set when queue 2 is in the active, suspended,
and trigger pending states.
The TOR2 trigger overrun can occur only when using an external
trigger mode or a periodic/interval timer mode. Trigger overruns
cannot occur when the software-initiated single-scan mode and the
software-initiated continuous-scan mode are selected.
TOR2 occurs when a trigger event is received while queue 2 is
executing, suspended, or a trigger is pending. TOR2 has no effect on
the queue execution. A trigger event that causes a trigger overrun is
not retained since it is considered unexpected.
An unexpected trigger event may be a system overrun situation,
indicating a system loading mismatch. The software acknowledges
that it has detected a trigger overrun being set by writing a 0 to the
trigger overrun, after the bit was read as a 1. Once set, only software
or reset can clear TOR2.
1 = At least one unexpected queue 2 trigger event has occurred.
0 = No unexpected queue 2 trigger events have occurred.
QS[9:6] — Queue Status Field
The 4-bit read-only QS field indicates the current condition of queue 1
and queue 2. There are five queue status conditions:
– Idle
– Active
– Paused
– Suspended
– Trigger pending
Technical Data MMC2107 – Rev. 2.0
432 Queued Analog-to-Digital Converter (QADC) MOTOROLA
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