+1 +1
+1
+1
+1
+1
+1
−1 −1
−1
−1
−1
−1
−1
−1
−1
−1
−1
+1
+1
+1
−1 −1 −1 −1 −1 −1
−1
+1 +1 +1 +1 +1 +1
+1
+1
+1
+1
+1
−1
−1
−1
QA
QB
QCLK
QDIR
QPOSCNT
QA
QB
QCLK
QDIR
QPOSCNT
(00)
(10)
(11)
(01)
(A,B)=
QEPA
QEPB
eQEP signals
10
01
00
11
Increment
counter
Decrement
counter
Decrement
counter
Increment
counter
Decrement
counter
Decrement
counter
Increment
counter
Increment
counter
Enhanced Quadrature Encoder Pulse (eQEP) Module
Figure 15-134. Quadrature Decoder State Machine
Figure 15-135. Quadrature-clock and Direction Decoding
1657
SPRUH73H – October 2011 – Revised April 2013
Pulse-Width Modulation Subsystem (PWMSS)
Copyright © 2011–2013, Texas Instruments Incorporated