ST7PSCR1E4M1/XXX View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7PSCR1E4M1/XXX

8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER

STMicroelectronics 

ST7SCR

12.4 SMARTCARD INTERFACE (CRD)

12.4.1 Introduction

The Smartcard Interface (CRD) provides all the re-

quired signals for acting as a smartcard interface

device.

The interface is electrically compatible with (and

certifiable to) the ISO7816, EMV, GSM and WHQL

standards.

Both synchronous (e.g. memory cards) and asyn-

chronous smartcards (e.g. microprocessor cards)

are supported.

The CRD generates the required voltages to be

applied to the smartcard lines.

The power-off sequence is managed by the CRD.

Card insertion or card removal is detected by the

CRD using a card presence switch connected to

the external CRDDET pin. If a card is removed, the

CRD automatically deactivates the smartcard us-

ing the ISO7816 deactivation sequence.

An maskable interrupt is generated when a card is

inserted or removed.

Any malfunction is reported to the microcontroller

via the Smartcard Interrupt Pending Register

Figure 29. Smartcard Interface Block Diagram

(CRDIPR) and Smartcard Status (CRDSR) Regis-

ters.

12.4.2 Main features

s Support for ISO 7816-3 standard

s Character mode

s 1 transmit buffer and 1 receive buffer

s 4-Mhz fixed card clock

s 11-bit etu (elementary time unit) counter

s 9-bit guardtime counter

s 24-bit general purpose waiting time counter

s Parity generation and checking

s Automatic character repetition on parity error

detection in transmission mode

s Automatic retry on parity error detection in

reception mode

s Card power-off deactivation sequence

generation

s Manual mode for driving the card I/O directly for

synchronous protocols

12.4.3 Functional Description

Figure 29 gives an overview of the smartcard inter-

face.

4 MHz

11-BIT

ETU COUNTER

POWER-OFF LOGIC

CRDCCR

CLK

CRD CRD CRD CRD CRD CRD

SEL

C4 C8 IO CLK RST VCC

COMMUNICATIONS CONTROL

9-BIT GUARDTIME COUNTER

CLOCK

CONTROL

CRDC4

CRDC8

CRDVCC

CRDRST

CRDCLK

24-BIT WAITING TIME COUNTER

PARITY GENERATION/CHECKING

0

CRD INTERRUPT

UART SHIFT REGISTER

1

CRDIO

UART BIT

UART RECEIVE BUFFER

CRDRXB

UART TRANSMIT BUFFER

CRDTXB

CARD DETECTION

LOGIC

CARD INSERTION/REMOVAL INTERRUPT

CRDDET

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