Philips Semiconductors

Short From Specification Rev. 2.0 February 2002

ISO 14443 Reader IC

MF RC531

7

PUBLIC

3.2.5 RESET PIN

The reset pin disables internal current sources and clocks and detaches the MF RC531 virtually from the µC

bus. If RST is released, the MF RC531 executes the power up sequence.

3.2.6 OSCILLATOR

Name

Type

Function

XIN

I

Oscillator Buffer Input

XOUT

O

Oscillator Buffer Output

The very fast on-chip oscillator buffer operates with a 13.56 MHz crystal connected to XIN and XOUT. If the

device shall operate with an external clock it may be applied to pin XIN.

3.2.7

MIFARE

The MF RC531 supports the active antenna concept of MIFARE

NPAUSE and KOMP of MIFARE

Name

Type

Function

MFIN

I with Schmitt Trigger

MIFARE

MFOUT

O

MIFARE

The MIFARE

RC531 separately in the following ways:

•

The analog circuit may be used stand-alone via the MIFARE

connected to the externally generated NPAUSE signal. The MFOUT pin provides the KOMP signal.

•

The digital circuit may be used to drive an external analog circuit via the MIFARE

the MFOUT pin provides the internally generated NPAUSE signal and MFIN will be connected to the

KOMP signal from the outside.

3.2.8 PARALLEL INTERFACE

16 pins control the parallel interface:

Name

Type

Function

D0

… D7

I/O with Schmitt Trigger

Bi-directional Data Bus

A0 … A2

I/O with Schmitt Trigger

Address Lines

NWR / RNW

I/O with Schmitt Trigger

Not Write / Read Not Write

NRD / NDS

I/O with Schmitt Trigger

Not Read / Not Data Strobe

NCS

I/O with Schmitt Trigger

Not Chip Select

ALE

I/O with Schmitt Trigger

Address Latch Enable

IRQ

O

Interrupt Request