AS3909 datasheet(43/77 Pages) AMSCO

43 / 77 page

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

AS3909/AS3910 – 43

Appl icatio n I n f o rm a t i o n

Figure 32:

Collision Register

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

Figure 33:

Number of Transmitted Bytes Register 0

Note(s) and/or Footnote(s):

1. Bits frm4 and antcl are cleared after transmission is performed.

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

Address # 0A: Collision Register

(for ISO-14443A only)

Type: R

Bit

Name

Function

Comments

7c_byte3

Number of full bytes before the bit

collision happened

6c_byte2

5c_byte1

4c_byte0

3c_bit2

Number of bits before the collision in

the byte where the collision happened

2c_bit1

1c_bit0

rfu

Not used, always 0

Address # 0B: Number of Transmitted Bytes

Type: RW

Bit

Name

Def.

Function

Comments

ntx1

Number of bytes to be

transmitted in one

command, LSB bits

Maximum supported number of bytes is

1023

6ntx00

5nbtx2

Number of bits in the split

byte

000 means that all bytes all

full

Applicable only to ISO-14443A bit oriented

anticollision frame in case last byte is split

byte

4nbtx1

3nbtx0

2Not used

frm4

4bit response frame

Has to be set to 1 when 4bit response frame

is expected (Mifare Ultralight)

antcl

ISO-14443 anticollision frame

Has to be set to 1 when ISO-14443A bit

oriented anticollision frame is sent

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