TC1784
Fast Analog to Digital Converter (FADC)
User´s Manual
24-14
V1.1, 2011-05
FADC, V2.21
24.2.6.5 Alias Feature
The alias feature is mainly meant for emulation purposes and does not need to be used
in standard applications. It allows a reassignment of the channel to be converted with
respect to the channel number that has been requested for conversion. This feature can
be used to redirect conversion requests to other input channels without changing the
request SW. For example, a SW from TC1766 (with only the two input channels 0 and
1), can be adapted to either channels 0 and 1 (compatibility to older products) or to
channels 2 and 3 instead. Especially when emulating several different devices with a
common emulation chip, the channel reassignment allows compatible SW usage with
different channel wiring to pins.
The setting of the input stages (incl. calibration information) is defined by register ACRx
of the input channel that is requested (no alias-mapping). I.e. the ACRx register of the
actually converted channel is used as it is permanently conntected to its channel. The
result handling (incl. interrupts) also refers to the requested channel number. The alias
feature is only taken into account as channel number for the conversion start.
Figure 24-6 Alias Feature
FADC_alias
requested
channel
number
Input
Stages and
Channel
Amplifiers
Conversion
Trigger
Generation
0
Alias Register
1
2
3
Conversion
Control
FADC
Input
Channels
A/D Converter
Stage
selected
channel
conversion
start
ALIAS2
ALIAS1
ALIAS0
ALIAS3
conversion
request
channel
number to
be converted
CHNR
channel settings
(ENN, ENP, gain, calibration data)
Содержание TC1784
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