L99H01 datasheet(32/53 Pages) STMICROELECTRONICS

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Functional description of the SPI

L99H01

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DocID15567 Rev 6

4.2.1

Command byte

Each communication frame starts with a command byte. It consists of an operating code

which specifies the type of operation (<Read>, <Write>, <Fault Reset>,

<Read Device Information>) and a 6-bit address.

Comments:

•

OCx: Operating code

•

Ax: Address

4.2.2

OpCode definition

The <Write Mode> and <Read Mode> operations allow access to the RAM of the device.

The <Clear Status> operation is used to read a status register and subsequently clear its

content.

<Read Device Information> allows access to the ROM area which contains device related

information such as <ID-Header>, <Product Code>, <Silicon Version and Category> and

<SPI-frame-ID>.

Table 24. DI

Command byte

DI - data byte

9876

543

210

OC1

OC0

Table 25. DO

Global Status byte

DO - data byte

76543210

GL_ER

STK_RESET_Q

TSD TW UV OV WDTO D7 D6 D5 D4 D3 D2 D1 D0

Table 26. Command byte

Command byte

MSB

LSB

Op code

Address

OC1

OC0

Table 27. Operating code definition

OC1

OC0

Meaning

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