TC1784
Analog to Digital Converter (ADC)
User´s Manual
23-91
V1.1, 2011-05
ADC, V1.3
The data valid flag is set and a result event occurs each time a data reduction
sequence is finished and the final result is available in the result register.
In order to support a wait-for-read and FIFO buffer features, the valid flag has to be
cleared automatically when SW does a read access or the result is transferred into
another FIFO element (if result FIFO buffering is enabled).
This behavior is contradictory to debugging requirements. For debugging, it has to be
possible to introduce read or write commands into the normal program flow, e.g. to
monitor conversion results. If a debugger reads out a result register, it would change the
status of the conversion result from valid = “new” (not yet read out) to “old” (already read
out). This would have an undesired impact on the application.
Therefore, the read views with “D” deliver the same value as the read views without “D”,
but without clearing the valid bit. As a result, a debugger using read views with “D” can
monitor the conversion results without influencing their status for the application.
To allow debugger accesses without the risk of data sequence corruption, two different
result register read views are supported. The read views refer to the same result register
contents, but show a different behavior according to the address that has been read:
•
Standard read view
and
A read action clears the corresponding valid bit.
•
Read view
for debugger:
A read action does not clear the corresponding valid bit.
Содержание TC1784
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