LRI64 datasheet(23/52 Pages) STMICROELECTRONICS

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LRI64

Flags and error codes

23/52

Flags and error codes

14.1

Request flags

In a request, the 8-bit flags field specifies the actions to be performed by the LRI64, and

whether corresponding fields are present or not.

Flag bit 3 (the Inventory_flag) defines the way the four most significant flag bits (5 to 8) are

used. When bit 3 is reset (0), bits 5 to 8 define the LRI64 selection criteria. When bit 3 is set

(1), bits 5 to 8 define the LRI64 Inventory parameters.

Table 3.

Request flags 1 to 4

Bit

Name

Value (1)

If the value of the request flag is a non authorized value, the LRI64 does not execute the command, and

does not respond to the request.

Description

Subcarrier flag

Single subcarrier frequency mode.

(Option 1 is not supported)

Data_rate flag

High data rate mode.

(Option 0 is not supported)

Inventory flag

Flags 5 to 8 meaning are according to Table 4

Flags 5 to 8 meaning are according to Table 5

Protocol extension flag

No Protocol format extension. Must be set to 0.

(Option 1 is not supported)

Table 4.

Request flags 5 to 8 (when bit 3 = 0)

Bit

Name

Value(1)

Only bit 6 (Address flag) can be configured for the LRI64. All others bits (5, 7 and 8) must be reset to 0.

Description

Select flag

No selection mode.

Must be set to 0.

(Option 1 is not supported)

Address flag

Non addressed mode.

The UID field is not present in the request. All LRI64 shall

answer to the request.

Addressed mode.

The UID field is present in the request. Only the LRI64 that

matches the UID answers the request.

Option flag(1)

No option. Must be set to 0.

(Option 1 is not supported)

8RFU(1)

No option. Must be set to 0.

(Option 1 is not supported)

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