MAX66100K-000AA+【PDF 10/16 页】IC RFID UID 64BIT TYPE B KEY FOB

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ISO 15693-Compliant 64-Bit UID

Request Flags, Inventory_flag Bit Not Set

BIT 8 (MSb)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1 (LSb)

0

Option_flag

Address_flag

Select_flag

0

Inventory_flag

(= 0)

Data_rate_flag Subcarrier_flag

Request Flags, Inventory_flag Bit Set

BIT 8 (MSb)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1 (LSb)

0

0

Nb_slots_flag

AFI_flag

0

Inventory_flag

(= 1)

Data_rate_flag Subcarrier_flag

Request Flags

The command descriptions on the subsequent pages

begin with a byte called request flags. The ISO 15693

standard defines two formats for the request flags byte.

The state of the Inventory_flag bit controls the function

of the bits in the upper half of the request flags byte.

The function of the request flags byte is as follows.

Inventory_flag Bit Not Set

Bits 8, 4: No Function. These bits have no function.

They must be transmitted as 0.

Bit 7: Options Flag (Option_flag). This bit is used with

block read commands to include the block security sta-

tus in the response. If not applicable for a command,

the Option_flag bit must be 0.

Bit 6: Address Flag (Address_flag). This bit specifies

whether all slaves in the master’s field that are in the

selected or ready state process the request (bit = 0) or

only the single slave whose UID is specified in the

request (bit = 1). If the Address_flag bit is 0, the

request must not include a UID. The combination of

both the Select_flag and Address_flag bits being set

(= 1) is not valid.

Bit 5: Select Flag (Select_flag). This bit specifies

whether the request is processed only by the slave in

the selected state (bit = 1) or by any slave according to

the setting of the Address_flag bit (bit = 0).

Bit 3: Inventory Flag (Inventory_flag). This bit must

be 1 for the Inventory command only. For all other com-

mands, this bit must be 0.

Bit 2: Data Rate Flag (Data_rate_flag). This bit speci-

fies whether the response data packet is transmitted

using the low data rate (bit = 0) or the high data rate

(bit = 1).

Bit 1: Subcarrier Flag (Subcarrier_flag). This bit

specifies whether the response data packet is transmit-

ted using a single subcarrier (bit = 0) or two subcarriers

(bit = 1).

Inventory_flag Bit Set

Bits 8, 7, 4: No Function. These bits have no function.

They must be transmitted as 0.

Bit 6: Slot Counter Flag (Nb_slots_flag). This bit

specifies whether the command is processed using a

slot counter (bit = 0) or without using the slot counter

(bit = 1).

Bit 5: Application Family Identifier Flag (AFI_flag).

To detect only slaves with a certain AFI value, the

AFI_flag bit must be 1 and the desired AFI value must

be included in the request. If the least significant nibble

of the AFI in the request is 0000b, slaves process the

command only if the most significant nibble of the AFI

matches. If the AFI in the request is 00h, all slaves

process the command regardless of their AFI.

Bit 3: Inventory Flag (Inventory_flag). This bit must

be 1 for the Inventory command only. For all other com-

mands, this bit must be 0.

Bit 2: Data Rate Flag (Data_rate_flag). This bit speci-

fies whether the response data packet is transmitted

using the low data rate (bit = 0) or the high data rate

(bit = 1).

Bit 1: Subcarrier Flag (Subcarrier_flag). This bit

specifies whether the response data packet is transmit-

ted using a single subcarrier (bit = 0) or two subcarriers

(bit = 1).

10

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