UM0934 datasheet(49/113 Pages) STMICROELECTRONICS

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UM0934

Host interface

Doc ID 17389 Rev 2

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5.3.4

CMD_ResetRequest (21h)

This command is used by the external host to force a software reset in the ST7570.

The host can decide to keep the current configuration (automatically refreshed through the

auto-reconfiguration procedure) or to reload the factory default settings.

After the reset, the ST7570 sends a confirmation with the same command code.

5.3.5

CMD_WriteDBRequest (41h)

This command is used by the external host to access an object of the MIB.

The ST7570 checks the parameters for validation:

●

If the check is valid, the object is updated in the database and ST7570 replies with a

CMD_WriteDBConfirm (Section 5.3.6)

●

If the check is not valid, the request is rejected and the ST7570 replies with a

CMD_WriteDBError (Section 5.3.7).

Table 23.

CMD_ResetRequest: Syntax

Source

Command(Args)

Possible response

Ext. host

CMD_ResetRequest(ResetData)

CMD_ResetRequest(ResetConfirm)

Table 24.

CMD_ResetRequest: ResetData

Byte index

Label

Description

RESET

Auto-reconfiguration bypass

0 = OFF: The system performs an auto-reconfiguration. All the registers are

refreshed with the previous configuration, if no corruption occurred

(Section 7.2)

1 = ON: The auto-reconfiguration is by-passed. All the registers are loaded

with the factory default values.

Table 25.

CMD_ResetRequest: ResetConfirm

Byte index

Label

Description

RESET

0: The reset request has been taken into account

Table 26.

CMD_WriteDBRequest: Syntax

Source

Command(Args)

Possible response

Ext. host CMD_WriteDBRequest(RequestData)

Request accepted:

CMD_WriteDBConfirm(RequestData)

Request rejected: CMD_WriteDBError(ErrorData)

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