LM3S8971 Luminary Micro, Inc, LM3S8971 Datasheet - Page 518

• Manufacturer Part Number: LM3S8971
• Description: Lm3s8971 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Quadrature Encoder Interface (QEI)
518
Bit/Field
5
4
3
2
1
0
CapMode
ResMode
SigMode
Enable
Name
VelEn
Swap
Type
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
Preliminary
Description
Capture Velocity
When set, enables capture of the velocity of the quadrature encoder.
Reset Mode
The Reset mode for the position counter. When 0, the position counter
is reset when it reaches the maximum; when 1, the position counter is
reset when the index pulse is captured.
Capture Mode
The Capture mode defines the phase edges that are counted in the
position. When 0, only the PhA edges are counted; when 1, the PhA
and PhB edges are counted, providing twice the positional resolution
but half the range.
Signal Mode
When 1, the PhA and PhB signals are clock and direction; when 0, they
are quadrature phase signals.
Swap Signals
Swaps the PhA and PhB signals.
Enable QEI
Enables the quadrature encoder module.
July 26, 2008