MFRC531 データシートの表示（PDF） - Philips Electronics

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MFRC531

ISO 14443 Reader IC

Philips Electronics 

Philips Semiconductors

ISO 14443 Reader IC

Short From Specification Rev. 2.0 February 2002

MF RC531

3.2.9 SPI COMPATIBLE INTERFACE

4 pins control the SPI compatible interface.

Name

A0

Type

I/O with Schmitt Trigger

A2

I/O with Schmitt Trigger

D0

I/O with Schmitt Trigger

ALE

I/O with Schmitt Trigger

Function

MOSI, master to slave

communication

SCK, clock to be generated by the

master

MISO, slave to master

communication

NSS, enables the SPI

communication

3.3 Applications

3.3.1 CONNECTING DIFFERENT µCONTROLLER'S

The MF RC531 supports different parallel µC interfaces and a SPI compatible interface. An intelligent auto-

detection logic automatically adapts the parallel interface to the respective bus system. Selection of the

device is performed with signal NCS.

To connect µ-Controllers using separated address and data bus pin ALE has to be connected to DVDD.

To connect µ-Controllers using multiplexed address and data bus pin ALE has to be connected to the signal

ALE of the µ-Controller

To connect µ-Controllers using RNW and NDS (instead of NWR and NRD) the µ-Controller’s RNW has to be

connected to pin NWR and NDS to pin NRD.

8

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