AS3909 데이터 시트보기 (PDF) - austriamicrosystems AG

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AS3909

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

austriamicrosystems AG 

Figure 17:

Sending Direct Commands

Application Information

SEN

SCLK

SDATAI

X

1

1

Two leading

ONE indicate

COMMAND

Mode

C5

C4

C3

SCLK raising

edge data is

transferred from

µC

C2

C1

C0

SCLK

falling edge

Data is sampled

X

SEN falling edge

signals start of

command execution

Figure 18:

Loading Transmitting Data into FIFO

Loading Transmitting Data into FIFO

Loading the transmitting data into the FIFO is similar to writing

data into an addressable registers. Difference is that in case of

loading more bytes all bytes go to the FIFO. The command mode

code 10 indicates FIFO operations. In case of loading

transmitting data into FIFO all bits <C5 – C0> are set to 0. Then

a bit-stream, the data to be sent (1 to 32 bytes), can be

transferred. In case the command is terminated by putting SEN

low before a packet of 8 bits composing one byte is sent, writing

of that particular byte in FIFO is not performed. Figure 18 shows

how to load the Transmitting Data into the FIFO.

SEN

SCLK

SDATAI

X1

0

10 pattern

indicates

FIFO mode

0

0

0

0

0

0

SCLK raising

edge data is

transferred from

µC

SCLK

falling edge

Data is sampled

Start of

payload

Data

1 to 32

bytes

X

SEN falling

edge signals

end of

COMMAND

Mode

AS3909/AS3910 – 26

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

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