AS3909 datasheet(42/77 Pages) AMSCO

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AS3909/AS3910 – 42

ams Datasheet, Confidential: 2013-Oct [3-02]

A p pl i c at io n I n f o r m at i o n

Note: At power up and after Set Default command, content of this register is set to 0.

After Interrupt register read, its content is set to 0

Figure 31:

FIFO Status Register

Note: At power up and after direct commands, Set Default and Clear content of this register is set to 0.

I_col

INTR due to bit collision

Valid only for ISO-14443A

Address # 09: FIFO Status Register

Type: R

Bit

Name

Function

Comments

7fifo_b5

Number of bytes (binary coded) in the

FIFO which were not read out

Valid range is from 000000 to 100000

6fifo_b4

5fifo_b3

4fifo_b2

3fifo_b1

2fifo_b0

fifo_ovr

FIFO overflow

0rx_act

Active receive. This bit is set to 1 when

start of transponder message is

detected and stays high until end of

receive.

By reading this bit it can be checked

whether transponder is answering. See also

Application Notes (Active receive).

Address # 08: Interrupt Register

Type: R

Bit

Name

Function

Comments

AS3909 데이터시트(PDF) 42 Page - ams AG

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