SR176 datasheet(15/35 Pages) STMICROELECTRONICS

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SR176

Device operations (instructions)

15/35

5.1

INITIATE()

Command Code = 06h,00h

Prior to any other command, the SR176 must be activated by an INITIATE command. All

other commands sent to the SR176 before the INITIATE are ignored. In response to

receiving the INITIATE command, the SR176 sends back its Chip_ID, using an 8-bit format

(Figure 17).

Upon receiving a valid INITIATE command, the SR176 switches to the ACTIVE state, where

it will not answer to any new INITIATE command. Once In the ACTIVE state, the SR176 will

remain in this state until it receives a valid SELECT command.

Request parameters (Figure 14):

●

none

Response parameters (Figure 15):

●

Chip_ID (formatted as shown in Figure 16)

Figure 14.

INITIATE request format

Figure 15.

INITIATE response format

Figure 16.

8-bit Chip_ID format

Figure 17.

INITIATE frame exchange between Reader and SR176

SOF

INITIATE

CRCL

CRCH

EOF

AI07670B

06h

00h

8 bits

SOF

Chip_ID

CRCL

CRCH

EOF

AI07701B

4 reserved bits

+ 4-bit ID

8 bits

AI07700B

Reserved bits (block 15)

Block 15

4-bit Chip_ID of the SR176

AI09783

Reader

SR176

SOF

Chip_ID

CRCL CRCH EOF

SOF

06h

CRCL

CRCH

EOF

00h

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