Microchip Technology DM164130-2 Hoja De Datos
F1 LV Evaluation Platform Motor Control Add-Ons
DS41629A-page 58
2012 Microchip Technology Inc.
During microstepping, the LinearSpeedProfile look-up table is not used: The drive val-
ues go directly from the microstep table into the CCP duty cycle registers without any
additional scaling. The microstepping tables consist of pre-scaled sine wave data for
one quarter of a full cycle. The factory default scaling factor for the two types of stepper
motors is 100% for the bipolar (250 maximum), and 50% for the unipolar (125 maxi-
mum). No scaling information about the table values residing in the Platform memory
is available to the GUI, therefore the “uStep %” box is blank. You have only the option
of generating a new table based on the scaling factor entered in the “uStep %” box.
When you generate a new microstep table, then the values are immediately placed in
the Platform RAM and will be lost at the next Reset. To make the new table values
endure Resets replace the EEPROM values with the new table values by selecting the
pull-down File->RAM->EEPROM option after creating the new table.
ues go directly from the microstep table into the CCP duty cycle registers without any
additional scaling. The microstepping tables consist of pre-scaled sine wave data for
one quarter of a full cycle. The factory default scaling factor for the two types of stepper
motors is 100% for the bipolar (250 maximum), and 50% for the unipolar (125 maxi-
mum). No scaling information about the table values residing in the Platform memory
is available to the GUI, therefore the “uStep %” box is blank. You have only the option
of generating a new table based on the scaling factor entered in the “uStep %” box.
When you generate a new microstep table, then the values are immediately placed in
the Platform RAM and will be lost at the next Reset. To make the new table values
endure Resets replace the EEPROM values with the new table values by selecting the
pull-down File->RAM->EEPROM option after creating the new table.