AS3910-BQFP 查看數據表（PDF） - austriamicrosystems AG

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AS3910-BQFP

13.56 MHz RFID Reader IC, ISO-14443 A/B

austriamicrosystems AG 

AS3910

Data Sheet - Application Information

8.11.3 Interrupt Register and Associated Registers

Table 17. Mask Interrupt Register

Address # 07: Mask Interrupt Register

Bit

Name

Def.

Function

7

M_osc

0 mask INTR when oscillator frequency is stable

6

M_nfc

0 mask INTR due to nfc event

5

M_wl

0 mask INTR due to FIFO water level

4

M_rxs

0 mask INTR due to end of receive

3

M_txe

0 mask INTR due to end of transmission

2

M_err

0 mask INTR due to error in receive data coding

1

M_crc

0 mask INTR due to CRC error

0

M_col

0 mask INTR due to bit collision

type: RW

Comments

Note: Default setting is set at power up and after Set Default command.

Table 18. Interrupt Register

Address # 08: Interrupt Register

Bit

Name

Function

7

I_osc INTR when oscillator frequency is stable

6

I_nfc INTR due to nfc event

5

I_wl INTR due to FIFO water level

4

I_rxs INTR due to end of receive

3

I_txe INTR due to end of transmission

2

I_err INTR due to error in receive data coding

1

I_crc INTR due to CRC error

0

I_col INTR due to bit collision

type: R

Comments

Set after enable

Set when nfc_t is 1 and en=0 informing that an RF field has

been detected,

Set when transmission could not be done due to detection of

RF field during RF Collision Avoidance

Set during receive, informing that FIFO is almost full and has

to be read out.

Set during transmit, informing that FIFO is almost empty and

that additional data has to be sent.

This includes parity error and framing error

Valid only for ISO-14443A

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

Table 19. FIFO Status Register

Address # 09: FIFO Status Register

type: R

Bit

Name

Function

Comments

7

fifo_b5

6

fifo_b4

5

4

fifo_b3

fifo_b2

Number of bytes (binary coded) in the FIFO which

were not read out

Valid range is from 000000 to 100000

3

fifo_b1

2

fifo_b0

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