LRI512 datasheet(19/54 Pages) STMICROELECTRONICS

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LRI512

MODES

The set of LRI512s that can answer a given Re-

quest are those whose current “Mode” is the ap-

propriate one for that request.

Addressed Mode

When the Address_flag is set to 1 (addressed

mode), the Request shall contain the Unique ID

(UID) of the addressed LRI512.

Any

LRI512

receiving

Request

with

the

Address_flag set to 1 shall compare the received

Unique ID to its own UID.

If it matches, it shall execute it (if possible) and re-

turn a Response to the VCD as specified by the

command description.

If it does not match, it shall remain silent.

Non-Addressed mode (General Request)

When the Address_flag is set to 0 (non-addressed

mode), the Request shall not contain a Unique ID.

Any

LRI512

receiving

Request

with

the

Address_flag set to 0 executes it and returns a Re-

sponse to the VCD as specified by the command

description.

Select Mode

When the Select_flag is set to 1 (select mode), the

Request shall not contain a LRI512 Unique ID.

The LRI512 in the Selected State receiving a Re-

quest with the Select_flag set to 1 executes it and

returns a Response to the VCD as specified by the

command description.

Only LRI512s in the Selected State answer to a

Request having the Select Flag set to 1.

The system design ensures in theory that only one

LRI512 can be in the Select state.

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