MAN0878-09-EN_XLE_XLT_UserManual
A u g u s t 2 3 , 2 0 1 8
P a g e 89 | 158
Asynchronous modes ignore the quadrature inputs and reset the quadrature accumulator to
zero on the configured edge (rising, falling or both). These are the most common settings
used. When configuring, asynchronous mode selections are prefixed with the word Async
.
Asynchronous Modes
o
Async, Reset on rising edge
o
Async, Reset on falling edge
o
Async, Reset on both edges
Synchronous modes synchronize the reset (or set) to the selected quadrature input and the
selected marker polarity. Figure 11.1 below indicates which mode to select based on the
markers timing diagram. Consult the documentation provided with your encoder to determine
the marker pulse timing.
Synchronous Modes
o
High, Reset on 1 rising
o
Low, Reset on 1 rising
o
High, Reset on 1 falling
o
Low, Reset on 1 falling
o
High, Reset on 2 rising
o
Low, Reset on 2 rising
o
High, Reset on 2 falling
o
Low, Reset on 2 falling
NOTE: The Marker input is sampled within 50
μ
s of the associated quadrature edge. It is left to
the user to determine if this meets the time constraints of the measured drive.
NOTE: If the Marker input pulse consecutively spans more than one of the specified edges,
quadrature-decoding operation is unpredictable.
