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ATSAM4S-XPLD
776
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
Figure 36-15.Predefined Connection of the Quadrature Decoder with Timer Counters
36.6.14.2Input Pre-processing
Input pre-processing consists of capabilities to take into account rotary sensor factors such as polarities and phase
definition followed by configurable digital filtering.
definition followed by configurable digital filtering.
Each input can be negated and swapping PHA, PHB is also configurable.
By means of the MAXFILT field in TC_BMR, it is possible to configure a minimum duration for which the pulse is stated
as valid. When the filter is active, pulses with a duration lower than MAXFILT+1 * tMCK ns are not passed to down-
stream logic.
as valid. When the filter is active, pulses with a duration lower than MAXFILT+1 * tMCK ns are not passed to down-
stream logic.
Filters can be disabled using the FILTER field in the TC_BMR register.
Timer/Counter
Channel 0
Channel 0
1
XC0
TIOA
TIOB
Timer/Counter
Channel 1
Channel 1
1
XC0
TIOB
QDEN
Timer/Counter
Channel 2
Channel 2
1
TIOB0
XC0
1
1
SPEEDEN
1
XC0
Quadrature
Decoder
(Filter + Edge
Detect + QD)
PHA
PHB
IDX
TIOA0
TIOB0
TIOB1
TIOB1
TIOA0
Index
Speed/Position
Rotation
Speed Time Base
Reset pulse
Direction
PHEdges
QDEN