L99DZ70XP datasheet(30/47 Pages) STMICROELECTRONICS

Part #	L99DZ70XP

Description	Door actuator driver

PDF	47 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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30 / 47 page

Functional description of the SPI

L99DZ70XP

30/47

Doc ID 15162 Rev 3

4.1.5

SPI communication flow

At the beginning of each communication the master can read the contents of the <SPI-

frame-ID> register (ROM address 03H) of the slave device. This 8-bit register indicates the

SPI frame length (24 bit) and the availability of additional features.

Each communication frame consists of a command byte which is followed by 2 data bytes.

The data returned on DO within the same frame always starts with the <Global Status>

Byte. It provides general status information about the device. It is followed by 2 data bytes (i.

e. ‘In-frame-response’).

For Write cycles the <Global Status> Byte is followed by the previous content of the

addressed register.

Figure 10. Write and read SPI

L99DZ70XP Datasheet(PDF) 30 Page - STMicroelectronics