STGAP1ASTR datasheet(48/70 Pages) STMICROELECTRONICS

48 / 70 page

Programming manual

STGAP1AS

48/70

DocID029344 Rev 2

Programming manual

9.1

SPI commands

The commands summary is given in Table 13.

9.1.1

StartConfig and StopConfig commands

Device parameters are configured by writing configuration values in configuration registers

(CFGx and DIAGxCFG), which is only possible by entering in configuration mode.

To switch the device to the configuration mode the StartConfig command must be sent. This

command is accepted when the SD line is low only. If the command has been correctly

received and interpreted, the IC registers writing is enabled.

The SD pin must be kept low during the whole configuration procedure, which is terminated

by the StopConfig command. If the SD pin is raised during the configuration procedure the

device immediately quits the configuration mode causing a fault error indicated by the

REGERRL and REGERRR bits. In this case all the changes operated on device

configuration are undone and the previous configuration is restored.

Table 13. SPI commands

Command mnemonic

Command value

Action

Notes

StartConfig

0 1 0 1

Device configuration start

Enter CFG mode

SD low only

StopConfig

1 1 0 1

Device configuration/check

completed

Leave CFG mode

SD low only

NOP

0 0 0 0

No operation

WriteReg

A A A A

A Write AAAAA register

CFG mode only

ReadReg

A A A A

A Read AAAAA register

ResetStatus

1 0 0 0

Reset all the status registers

SD low only

GlobalReset

0 1 0 1

Global reset

CFG mode only

Sleep

1 0 1 0

Device enters in standby mode

SD low only

Table 14. StartConfig command synopsis

Byte

To device

0010 1010

1101 1010(1)

1. The CRC byte of the command, if the CRC check is disabled this byte is ignored.

Table 15. StopConfig command synopsis

Byte

To device

0011 1010

1010 1010(1)

1. The CRC byte of the command, if the CRC check is disabled this byte is ignored.

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