www.ams.com

Revision 1.0

30 - 42

AS3953

Datasheet - A pp l ic a t io n I n f or m a t i on

8.3 Registers

The 6-bit register addresses below are defined in the hexadecimal notation. The possible address range is from 00h to 3Fh.

There are two types of registers implemented in the AS3953: configuration registers and display registers. The configuration registers are used

to configure the AS3953. They can be written and read through the SPI (RW). The display registers are read only (RO); they contain information

about the AS3953 internal state, which can be accessed through the SPI.

8.3.1 Overview of Registers

8.3.2 IO Definition Register

IO Configuration Register.

Note:

This register is directly supplied by VP_SPI. Its initial state is unknown.

Table 11. List of the SPI Interface Internal Registers

Address

[hex]

Content

Type

00

IO Configuration Register

RW

01

Mode Definition Register

RW

02

Bit Rate Definition Register

RW

04

RFID Status Display Register

RO

05

RATS Register

RO

08

Mask Main Interrupt Register

RW

09

Mask Auxiliary Interrupt Register

RW

0A

Main Interrupt Register

RO

0B

Auxiliary Interrupt Register

RO

0C

FIFO Status Register 1

RO

0D

FIFO Status Register 2

RO

10

Number of Transmitted Bytes Register 1

RW

11

Number of Transmitted Bytes Register 2

RW

Address# 00h : IO Configuration

Type: RW

Bit

Name

Default

Function

Comments

7

miso_pd2

x

1:

Pull-down on MISO, when \SS is low

and MISO is not driven by the AS3953

6

miso_pd1

x

1:

Pull-down on MISO when \SS is high

5

RFU

4

RFU

3

RFU

2

RFU

1

RFU

0

RFU