Quadrature Decoder Boundary Conditions - NXP Semiconductors freescale KV4 Series Reference Manual

phase A
phase B
FTM counter
increment/decrement
FTM counter
CNTIN
0x0000
Figure 39-257. FTM counter overflow in down counting for Quadrature Decoder mode

39.5.25.1 Quadrature Decoder boundary conditions

The following figures show the FTM counter responding to motor jittering typical in
motor position control applications.
phase A
phase B
FTM counter
MOD
CNTIN
0x0000
Figure 39-258. Motor position jittering in a mid count value
The following figure shows motor jittering produced by the phase B and A pulses
respectively:
Freescale Semiconductor, Inc.
-1 -1 -1 -1 -1 -1
-1 -1 -1 -1
MOD
set TOF
clear TOFDIR
KV4x Reference Manual, Rev. 2, 02/2015
Preliminary
Chapter 39 FlexTimer Module (FTM)
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
-1
set TOF
clear TOFDIR
-1 -1
Time
Time
1017