TC1784
Analog to Digital Converter (ADC)
User´s Manual
23-44
V1.1, 2011-05
ADC, V1.3
pending conversion requests at the same time.
Starting with request source 0, the arbiter checks if an enabled request source has a
pending request for a conversion. The arbitration winner is the request source with a
pending conversion request and the highest priority that has been found first in an
arbitration round.
23.2.7.2 Conversion Start Modes
To start the requested conversion of the arbitration winner, the following aspects are
automatically taken into consideration by the arbiter:
•
If the converter is currently idle (no conversion running), the conversion of the
arbitration winner is started immediately.
•
If a conversion is currently running, the arbitration winner is compared to the priority
of the currently running conversion. In the case that the current conversion has the
same or a higher priority, it is completed. Then, the conversion of the arbitration
winner is started.
•
If a conversion is currently running, the arbitration winner is compared to the priority
of the currently running conversion. In the case that the current conversion has the
lower priority and the arbiter winner has been programmed for
wait-for-start mode
,
the currently running conversion is completed. Then, the conversion of the arbitration
winner is started.
This mode can be used if the timing requirement for the higher priority conversions
allow a jitter (between t3 and t4 in
) in the range of a running conversion.
•
If a conversion is currently running, the arbitration winner is compared to the priority
of the currently running conversion. In the case that the current conversion has the
lower priority and the arbiter winner has been programmed for
cancel-inject-repeat
mode
, the current conversion is aborted immediately if a new request with a higher
priority has been found, unless both requests target the same result register with
wait-for-read active (see
). The conversion of the arbitration winner
is started after the abort action. The aborted conversion request is restored in the
request source that has requested the aborted conversion. As a consequence, it
takes part again in the next arbitration round.
Please note that the abort mechanism can take between 1 and 3 f
ADCI
cycles,
depending on the state of the current conversion.
This mode can be used if higher priority conversions only tolerate a small jitter
(between t8 and t9 in
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