L99PD08 datasheet(26/41 Pages) STMICROELECTRONICS

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SPI

L99PD08

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Doc ID 15872 Rev 3

6.3.3

Operating code definition

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

e.g. write to control registers or read status information.

A <Clear Status> Operation addressed to a device specific status register will read back and

subsequently clear this status register. A <Clear Status> Operation with address 3FH clears

all status registers at a time and reads back the <Configuration> byte.

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

information such as the product family, product name, silicon version and register width.

6.3.4

Global status byte

Table 20.

Operating code definition

OC1

OC0

Description

Table 21.

Global status byte

Bit

Name

Global error

flag

Communication

error

No (chip reset or

communication

error)

Over temp/

over load

n/a

Open-

load

STK_ON

Fail save

Table 22.

Global status byte: description

Name

Polarity

Comment

Global error flag

Active high

Logical OR combination of all failures in the

<Global Status Register> (initially set to '1').

Communication error

Active high

Set if the number of clock cycles during CSN low

does not match with the specified frame width.

SDI stuck at '0' will force the LHOME-bit to be

cleared and is not signaled as a communication

error. SDI stuck at '1' will lead to a software reset

and is therefore not signaled as a

communication error. FAIL SAVE is entered in

both cases.

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