ST25R3910 datasheet(45/65 Pages) STMICROELECTRONICS

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ST25R3910

1.3.10

FIFO Status Register

Address: 09h

Type: RW

1.3.11

Collision Register (ISO-14443A only)

Address: 0Ah

Type: R

Table 17. FIFO Status Register(1)

Bit

Name

Default

Function

Comments

fifo_b5

Number of bytes (binary coded) in the

FIFO that have not been read out

Valid range is from 000000 to 100000

fifo_b4

fifo_b3

fifo_b2

fifo_b1

fifo_b0

fifo_ovr

1: FIFO overflow

rx_act

1: Reception active

This bit is set to 1 when the start of a tag

message is detected, and stays high until

the end of the tag message is detected.

1. Default setting takes place at power-up, after Set Default and after Clear commands.

Table 18. Collision Register (ISO-14443A only)(1)

Bit

Name

Default

Function

Comments

c_byte3

Number of full bytes before the

byte where the collision happened

c_byte2

c_byte1

c_byte0

c_bit2

Number of bits before the bit

where the collision happened

c_bit1

1c_bt0

rfu

Not used

1. Default setting takes place at power-up, after Set Default and after Clear content commands.

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