Information

phase A
phase B
FTM counter
increment/decrement
FTM counter
MOD
CNTIN
0x0000
Time
set TOF
clear TOFDIR
-1
set TOF
clear TOFDIR
-1
-1
-1
-1
-1
-1
-1
-1
-1-1
-1
-1
-1
-1
-1-1
-1
-1
-1
-1
-1
-1
-1
-1
Figure 37-254. FTM counter overflow in down counting for Quadrature Decoder mode
37.4.25.1 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
Time
Figure 37-255. Motor position jittering in a mid count value
The following figure shows motor jittering produced by the phase B and A pulses
respectively:
Functional description
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
956
Preliminary
Freescale Semiconductor, Inc.
General Business Information