L9779WD-SPI datasheet(112/141 Pages) STMICROELECTRONICS

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Functional description

L9779WD-SPI

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DocID027721 Rev 2

Command register

This command disables (“lock”) writing of all configuration registers. The commands have

no relevant data as command data bit – they may be set to ‘1’ or ‘0’.

Default state is configuration registers not locked.

The content of lockable bit is valid both if the bits are locked or if they are unlocked. Writing

data to the bit is possible if the bits are unlocked; the new values become valid during the

execution of the write command.

This command generates a L9779WD-SPI internal reset initiated by the µC’s software

(“software reset”) that clears all the configuration and diagnostic registers and switch-off all

the drivers.

The command has no relevant data as command data bit – they may be set to ‘1’ or ‘0’.

Table 56. CLOCK_UNLOCK_SW_RST

Bit

DIN

SPI ERROR

ADD(4)

ADD(3)

ADD(2)

ADD(1)

ADD(0)

9X0

8X0

7X0

6X0

5X0

4X0

3X0

SW_RESET

1LOCK

LOCK

Odd Parity

Table 57. START_REACT

Bit

DIN

SPI ERROR

ADD(4)

ADD(3)

ADD(2)

ADD(1)

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