L99MOD50XP datasheet(27/42 Pages) STMICROELECTRONICS

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DS12615 Rev 4

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L99MOD50XP

Functional description of the SPI

Ocx: Operation code

Ax: Address

Dx: Data Bit

4.2

Command byte

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

which specifies the type of operation (<Read>, <Write>, <Read and Clear>, <Read Device

Information>) and a 6 bit address. If less than 6 address bits are required, the remaining bits

are unused but are reserved.

4.2.1

Operation code definition

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

A <Read and Clear Mode> operation is used to read a status register and subsequently

clear its content.

The <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>.

4.3

Global status byte

Table 19. SPI frame

Command byte

Data byte

Bit

Name

OC0 A5

Table 20. Operation code definition

OC1

OC0

Meaning

Table 21. Global status byte

Bit

Name

GL_ER

CO_ER

C_RESET

TSD

UOV_OC

Reset

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