L6480 Datasheet, PDF (20/73 Pages) STMicroelectronics – The L6480, realized in analog mixed signal technology, is an advanced fully integrated solution suitable for driving two-phase bipolar stepper motors with microstepping.

Functional description
Figure 4. Charge pump circuitry
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6.4
Microstepping
The driver is able to divide the single step into up to 128 microsteps. Stepping mode can be
programmed by the STEP_SEL parameter in the STEP_MODE register (Table 20.).
Step mode can be only changed when bridges are disabled. Every time the step mode is
changed, the electrical position (i.e. the point of microstepping sinewave that is generated)
is reset to the first microstep and the absolute position counter value (Section 6.5) becomes
meaningless.
Figure 5. Normal mode and microstepping (128 microsteps)
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Doc ID 023278 Rev 3