TC1784
Analog to Digital Converter (ADC)
User´s Manual
23-76
V1.1, 2011-05
ADC, V1.3
23.2.13
Channel-Related Functions
The channel control unit defines the conversion settings, that can be programmed
individually for each analog input channel. Therefore, a channel control register
is associated to each analog input channel CHx. After the arbiter
has determined the channel to be converted, the defined settings are applied to the AD
converter, comprising information about:
•
Conversion parameters:
Bit field ICLSEL defines which input class is taken into account for the conversion
(see
•
Reference selection:
Bit field REFSEL defines which reference input is used for the conversion (see
•
Channel event handling:
Bit fields LCC, BNDASEL, and BNDBSEL define which boundaries are used for limit
checking (see
) and which channel event leads to a channel event
interrupt (see
).
•
Synchronous conversion request:
Bit SYNC defines if the channel triggers a synchronized conversion (see
).
•
Alias feature:
In addition to the general channel control, the ADC kernel supports a mechanism
(named alias feature, see
) to redirect a conversion request to
another channel number.
23.2.13.1 Input Classes
An input class defines the length of the sample phase and the resolution of the
conversion. In most applications, the characteristics of the input circuitries (RC input low-
pass filter and impedance of the signal source) are quite similar for several analog input
signals, leading to similar timings for the sample phase of these channels. As a
consequence, input channels with similar parameters can be grouped together to form
an input class.
All channels with the same ICLSEL setting belong to the same input class and have the
same sample phase length and resolution. In the TC1784, 4 input classes are supported.
Registers
can be programmed to adjust the sample time and the
resolution to the application requirements independently for each input class.
The default setting of these registers lead to the minimum sample phase length of 2 f
ADCI
cycles and conversions with 10 bits resolution. If this default setting fits to the application
requirements, bit fields
.ICLSEL and registers
need not to be changed.
Содержание TC1784
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