AS3955 datasheet(84/102 Pages) AMSCO

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[v1-04] 2016-Feb-03

AS3955 − Register Description

Figure 96:

Buffer Status Register 1

Note(s):

1. Power-up and commands Set Default and Clear Buffer reset the content of this register to 0.

NFC Last Address Register

Figure 97:

Last NFC Address Access Register

Note(s):

1. Power-up and commands Set Default and Clear Buffer reset the content of this register to 0.

Address 0Dh: Buffer Status Register 1

Bit

Name

Function

Type

7rfu

6rfu

5rf_busy

Extended mode buffer status flags (see Extended Mode); io_

busy flag is omitted since in this it is always zero when this byte

is read out

rf_data_rdy

io_data_rdy

2rfu

1buf_unf

Buffer underflow. Set when read more bytes then actual content

of buffer

0buf_ovr

Buffer overflow. Set when written more bytes then actual

content of buffer

Address 0Eh: Last NFC Address Access

Bit

Name

Function

Type

last_addr<7>

Contains last address accessed by reader. Updated on internal

EEPROM access over RF. The address is 8 bit long and contains

also access attempts that are higher than the EEPROM address

space. Value FFh indicates that the value is being updated and

is not valid.

last_addr<6>

last_addr<5>

last_addr<4>

last_addr<3>

last_addr<2>

last_addr<1>

last_addr<0>

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