L6474 datasheet(45/51 Pages) STMICROELECTRONICS

45 / 51 page

L6474

Programming manual

Doc ID 022529 Rev 2

45/51

Any attempt to read an inexistent register (wrong address value) causes the command to be

ignored and the WRONG_CMD flag to rise at the end of command byte, the same is true

when an unknown command code is sent.

9.2.5

Enable

The Enable command turns on the power stage of the device.

When the motor is in high-impedance state, an Enable command forces the bridges to exit

from high impedance state.

This command can be given anytime and is immediately executed.

9.2.6

Disable

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

raises the HiZ flag.

This command can be given anytime and is immediately executed.

9.2.7

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 34.

HardStop command structure

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

from host

Table 35.

Disable command structure

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

from host

Table 36.

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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