TC1784
Fast Analog to Digital Converter (FADC)
User´s Manual
24-16
V1.1, 2011-05
FADC, V2.21
24.2.7.1 Filter Block Structure
The filter block consists of an adder and several result registers for calculating filter
output data from the filter input data. For filter n, the Current Result Register CRRn is
used for adding up conversion results. After a programmable number of conversion
results have been added, the contents of CRRn are stored as intermediate result in the
Intermediate Result Register IRR1n. The three intermediate result registers operate like
a pipeline. Before IRR1n is overwritten, IRR2n is transferred to IRR3n, and IRR1n is
transferred to IRR2n. The Final Result Register FRRn stores the sum that is built by the
contents of the current result register and the intermediate result registers.
All result registers of the filter block can be read at any time. Please note that only one
intermediate result register is available in filter block 1 (IRR11) and in filter block 3
(IRR13).
Figure 24-8 Filter Block Structure
24.2.7.2 Filter Block Operation
A filter block can be used for data-reduction or anti-aliasing filtering of the conversion
results (n indicates the number of the filter block). It performs a combination of data
reduction by adding and a moving average operation.
•
A continuous A/D conversion is running on channel x.
•
The filter input selection is set to channel x (FCRn.INSEL = 100
B
+ x).
•
The addition length is controlled by FCRn.ADDL defining how many conversion
results are added to build one intermediate result (intermediate cycle).
MCA06436_m
filter
block n
FRRn
CRRn
IRR1n
IRR2n
IRR3n
1)
1)
1) Registers are not available in filter blocks 1 and 3
Filter
Output
Value
Filter
Input
Value
SFRRn
2)
2) Registers available only in filter blocks 1 and 3
Содержание TC1784
Страница 1: ...User s Manual V1 1 2011 05 Microcontrollers TC1784 32 Bit Single Chip Microcontroller ...
Страница 3: ...User s Manual V1 1 2011 05 Microcontrollers TC1784 32 Bit Single Chip Microcontroller ...
Страница 950: ...TC1784 Direct Memory Access Controller DMA User s Manual 11 132 V1 1 2011 05 DMA V3 03 ...
Страница 1949: ...TC1784 General Purpose Timer Array GPTA v5 User s Manual 21 297 V1 1 2011 05 GPTA v5 V1 14 ...
Страница 2350: ...w w w i n f i n e o n c o m Published by Infineon Technologies AG Doc_Number ...