VNF1048F datasheet(30/52 Pages) STMICROELECTRONICS

30 / 52 page

Table 30. Clear all status registers (RAM access)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Command

OC1

OC0

Address

DATA1

X(1)

DATA2

DATA3

1. X: do not care

6.10

Global status byte

As per ST SPI 4.1 specification, the device features an In-Frame response mechanism.

A global status byte is transmitted to the SPI Master on the SDO line while the command byte is received on the

SDI line.

The global status byte reports the global status of the device:

Table 31. Global status byte

Global status byte

Bit

MSB

LSB

Name

GSBN

RSTB

SPIE

AUTOON

DIAGS

OVC

Table 32. Global status byte - bit description

Bit #

Name

Description

GSBN

Global status bit NOT

This bit is a NOR combination of the remaining bits of this register:

GSBN = NOT (RSTB or SPIE or AUTOON or DIAGS or DE or OVC or FS)

This bit can also be used as Global Status Flag without starting a complete communication frame as it is

present directly after pulling CSN low.

RSTB

Reset bit

The RSTB indicates a device hardware reset. This bit is set in PowerON mode. All internal Control

Registers are set to default and kept in that state until the bit is automatically cleared by the first valid

SPI communication.

SPIE

SPI error

The SPIE is a logical OR combination of errors related to a wrong SPI communication: SDI stuck-at fault,

SPI frame length ≠ 32bit (wrong number of clock pulses while CSN is low), parity check error

AUTOON

The AUTOON indicates the automatic turn-on of the external FET due to Low Current Bypass de-saturation

(BYPASS_SAT = 1) when its VDS exceeds fixed threshold (~1.3 V). This bit will be also set by a transition

from WakeUp to Unlocked mode.

AUTOON = BYPASS_SAT

DIAGS

Diagnostic signal bit

VNF1048F

Global status byte

DS13084 - Rev 6

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