SR176 datasheet(14/35 Pages) STMICROELECTRONICS

14 / 35 page

Device operations (instructions)

SR176

14/35

Device operations (instructions)

All instructions, data and the CRC are transmitted to the SR176 in 10-bit character format

using ASK modulation. The start bit (b0 of the 10 bits) is sent first. The command frame

received by the SR176 on the antenna is demodulated by the 10% ASK demodulator, and is

decoded by internal logic. Prior to any operation, the SR176 must have been previously

activated by an INITIATE command (as shown in Figure 13). Each frame transmitted to the

SR176 must start with a Start Of Frame, followed by one or more data characters, and is

ended by two CRC bytes and the End Of Frame. When an invalid frame is decoded by the

SR176 (because of a wrong instruction or CRC error), the memory does not send any error

code.

When a valid frame is received, the SR176 may have to send back data to the reader. For

this, it sends 10-bit characters back, with SOF, CRC and EOF, using the BPSK coding. The

transfer is ended by the SR176 sending the EOF.

Figure 13.

State transition diagram

AI09063B

DEACTIVATED

DESELECTED

POWER-OFF

READY

ACTIVE

SELECTED

INITIATE()

In Field

Out of

Field

Out of

Field

SELECT(Chip_ID)

COMPLETION

Out of

Field

Out of

Field

SELECT(Chip_ID)

SELECT( = Chip_ID)

SELECT(Chip_ID)

READ_BLOCK()

WRITE_BLOCK()

PROTECT_BLOCK()

GET_PROTECTION()

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