L6470 datasheet(64/70 Pages) STMICROELECTRONICS

64 / 70 page

Programming manual

L6470

64/70

Doc ID16737 Rev 4

The SoftHiZ command disables the power bridges (high impedance state) after a

deceleration to zero; the deceleration value used is the one stored in the DEC register (see

Section 9.1.6). When bridges are disabled, the HiZ flag is raised.

When the motor is stopped, a SoftHiZ command forces the bridges to enter into high

impedance state.

This command can be given anytime and is immediately executed. This command keeps

the BUSY flag low until the motor is stopped.

9.2.19

HardHiZ

The HardHiZ command immediately disables the power bridges (high impedance state) and

raises the HiZ flag.

When the motor is stopped, a HardHiZ command forces the bridges to enter into high

impedance state.

This command can be given anytime and is immediately executed. This command keeps

the BUSY flag low until the motor is stopped.

9.2.20

GetStatus

The GetStatus command returns the STATUS register value.

The GetStatus command resets the STATUS register warning flags. The command forces

the system to exit from any error state. The GetStatus command DOES NOT reset the HiZ

flag.

Table 55.

HardHiZ command structure

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

101010

from host

Table 56.

GetStatus command structure

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

from host

STATUS MSByte

to host

STATUS LSByte

to host

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