TC1784
Analog to Digital Converter (ADC)
User´s Manual
23-92
V1.1, 2011-05
ADC, V1.3
23.2.15.2 Wait-for-Read Mode
The wait-for-read mode is a feature of a result register allowing the CPU (or DMA) to treat
each conversion result independently without the risk of data loss. Data loss could occur
if the CPU does not read a conversion result from a result register before a new result
overwrites the previous one.
Especially for auto-scan conversion sequences (or other sequences with “relaxed”
timing requirements), the wait-for-read offers the possibility to request a conversion
sequence according to an event (HW or SW), but to start a new conversion according to
the CPU capability to read the formerly converted result.
If wait-for-read mode is enabled for a result register by setting bit WFR in register
, a request source does not generate a conversion request while the targeted
result register contains valid data (indicated by the valid flag VFx = 1) or if a currently
running conversion targets the same result register.
A new conversion request is generated only after the targeted result register has been
read out.
If two request sources target the same result register with wait-for-read selected, a lower
priority request started before the higher priority source has requested its conversion can
not be interrupted by the higher priority request. If a higher priority request targets a
different result register, the lower priority conversion can be cancelled and repeated
afterwards.
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