L9396 datasheet(89/109 Pages) STMICROELECTRONICS

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DS12539 Rev 6

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L9396

Serial Peripheral Communication

108

Serial Peripheral Communication

The SPI interface is used to configure the device, control the output and read the diagnostic

and output status registers.

The SPI protocol is defined by frames of 32 bits with 3 bits of CRC (Cyclic Redundancy

Check) both in input and output directions.

Every time the device sets a Clear on Read bit in one of the SPI registers (for example when

an error is detected), such a bit will not be cleared until the corresponding register is read

via SPI. The bit will not be reset if an SPI error occurs during the access to the register by

the microcontroller or while L9396 sends the content of the register as an answer.

8.1

CRC Field Details

SPI frame (upstream/downstream) include a 3-bit CRC field. CRC field is evaluated

/checked by using a three-degree poly G3(x) = x3+x+1 and covers the bits 0:28 in the SPI

frame.

CRC flops are initialized to 0 at the beginning of the SPI frame.

8.2

SPI frame

SDI

Bit 0 to 15

Bit 16 to 31

SDI

Frame 0

Frame 1

SDO

Frame 0

Frame 1

FRAME 0

23456

W/R ADD

DATA[19..13]

FRAME 1

DATA[12..0]

CRC[2..0]

L9396 数据表(PDF) 89 Page - STMicroelectronics

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