TDA8031 Datasheet, PDF (13/57 Pages) NXP Semiconductors – USB smart card reader (OTP or ROM)

Philips Semiconductors
USB smart card reader (OTP or ROM)
Product specification
TDA8030; TDA8031
8 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_Ap_La_Egewidth
CS
D0 to D7
RD
WR
address
data read
address
data write
MGU885
Fig.5 Control via MOVX instructions.
2003 Jul 04
13