TDA8030 datasheet(13/57 Pages) PHILIPS

13 / 57 page

2003 Jul 04

Philips Semiconductors

Product speciﬁcation

USB smart card reader (OTP or ROM)

TDA8030; TDA8031

FUNCTIONAL DESCRIPTION

Throughout this specification, it is assumed that the reader

is aware of ISO7816 and USB norms terminology.

8.1

ISO7816 UART AND ASSOCIATED LOGIC

This section describes how the integrated ISO7816 UART

operates, how it can be programmed by means of its

control registers and how it is internally interfaced to the

embedded microcontroller.

8.1.1

INTERFACE CONTROL

The ISO7816 UART can be controlled via an 8-bit parallel

bus. This bus is directly (internally) connected to Port 0

(P07 to P00) of the embedded 83C51 microcontroller.

The registers within the ISO7816 UART may be written to

or read from by using the standard 83C51 MOVX

instructions. It should be noted, that only if pin P27/A15 is

HIGH, can the UART be accessed.

When pin P27/A15 is HIGH, the demultiplexing of address

and data is done internally by means of the ALE signal.

A LOW pulse on pin P37/RD enables the selected register

to be read, a LOW pulse on pin P36/WR enables the

selected register to be written to.

The ISO UART interrupt line is directly connected to the

microcontrollers External Interrupt 0 input, pin P32/INT0.

For that reason, the External Interrupt 0 of the 83C51

microcontroller must be enabled to ensure a proper

function.

handbook, full pagewidth

MGU885

ALE

D0 to D7

data read

address

data write

Fig.5 Control via MOVX instructions.

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