L6474PD View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L6474PD

Fully integrated microstepping motor driver

STMicroelectronics 

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Programming manual

L6474

9.1.10

STEP_MODE

The STEP_MODE register has the following structure:

Table 18. STEP_MODE register

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

1

SYNC_SEL

1 (1)

1. When the register is written this bit should be set to 1.

Bit 1

STEP_SEL

Bit 0

The STEP_SEL parameter selects one of five possible stepping modes:

Table 19. Step mode selection

STEP_SEL[20]

Step mode

0

0

0

Full step

0

0

1

Half step

0

1

0

1/4 microstep

0

1

1

1/8 microstep

1

X

X

1/16 microstep

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.

Warning: Every time STEP_SEL is changed the value in ABS_POS

register loses meaning and should be reset.

Any attempt to write the register when the outputs are enabled causes the command to be

ignored and the NOTPERF_CMD flag to rise (see Section 9.1.13 on page 41).

The SYNC output provides a synchronization signal according to SYNC_SEL parameter.

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