L99LD02 datasheet(30/66 Pages) STMICROELECTRONICS

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Serial peripheral interface (ST SPI standard)

L99LD02

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DS12448 Rev 3

The operation code is used to distinguish between different access modes to the registers of

the slave device.

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

The Read and Clear operation is used to read a status register and subsequently clears its

content.

The Read Device Information allows access to the ROM area which contains device specific

read-only data (like Device ID and SPI settings device related information) predefined by

the ST SPI standard.

5.2.2

SDO Frame

The Data-Out Frame consists of 32 bits (GSB + Data).

The first eight transmitted bits contain device-related status information and are latched into

the shift register at the time of the Communication Start. These 8 bits are transmitted at

every SPI transaction.

The subsequent bytes contain the payload data and are latched into the shift register with

the eighth positive SCK edge. This could lead to an inconsistency of data between the GSB

and Payload due to different shift register load times. Anyhow, no unwanted Status Register

clear should appear, as status information should just be cleared with a dedicated bit clear

after read.

Table 11. Data byte 1

Data byte 1

Bit

141312

Name

D15

D14

D13

D12

D11

D10

Table 12. Data byte 0

Data byte 0

Bit

6543210

Name

Table 13. Operation code definition

OC1

OC0

Meaning

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