MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 457
MMC2114
Manufacturer Part Number
MMC2114
Description
M CORE Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MMC2114.pdf
(654 pages)
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MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
TOR1 — Queue 1 Trigger Overrun Flag
TOR2 — Queue 2 Trigger Overrun Flag
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 be set when the software-initiated single-scan mode or
the software-initiated continuous-scan mode is selected.
TOR1 is set when a trigger event is received while a queue is
executing and before the scan has completed or paused. TOR1 has
no effect on 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 denote a system overrun situation.
In externally gated continuous-scan mode, the behavior 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 is 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 sets for the second
end-of-queue 1 condition. For TOR1 to set, CF2 must not be cleared
before the second end-of-queue 1.
Once set, TOR1 is cleared only by a reset or by writing a 0 to it.
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.
Freescale Semiconductor, Inc.
For More Information On This Product,
Queued Analog-to-Digital Converter (QADC)
1 = At least one unexpected queue 1 trigger event has occurred or
0 = No unexpected queue 1 trigger events have occurred.
queue 1 reaches an end-of-queue condition for the second
time in externally gated continuous scan.
Go to: www.freescale.com
Queued Analog-to-Digital Converter (QADC)
Register Descriptions
Advance Information
457
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