Smartcard MCU with 32-bit ARM Cortex™ M3 CPU
259a.ai
Micromodule Wafer
and 256 Kbytes high density Flash memory
Features
Hardware features
■ ARM Cortex™-M3 32-bit RISC core
■ 8 Kbytes of user RAM
■ 256 Kbytes of user Flash memory with OTP
area:
– 10-year data retention
– 100,000 Erase/Write cycles per page
– Page granularity of 128 Bytes
– Block granularity: 1 Kbyte
– 128 Bytes of OTP for User
– Page Erase time 3 ms
– Block Erase 1 Kbyte in 15 ms
– Programming performance up to 10µs/byte
– Flash Erase / Write Protection software
programmable on 64 Kbyte sectors
■ Asynchronous Receiver Transmitter
supporting ISO 7816-3 T=0 and T=1 protocols
■ Two 16-bit timers with interrupt capability
■ 1.8V, 3V and 5V supply voltage ranges
■ External clock frequency from 1 up to 7.5 MHz
■ High performance provided by:
– CPU clock frequency up to 20 MHz
– External clock multiplier (2x, 3x, and 4x)
■ Current consumption compatible with GSM
and ETSI specifications
■ Power-saving Standby state
■ Contact assignment compatible ISO 7816-2
■ ESD protection greater than 4 kV (HBM)
ST32F256
Data brief
Security features
■ Monitoring of environmental parameters
■ Protection against faults
■ ISO 3309 CRC calculation block
■ True random number generator
■ Unique serial number on each die
■ Hardware DES accelerator
Software features
■ Flash Loader
■ Flash drivers
Development environment
Software development and firmware generation
are supported by a comprehensive set of
development tools dedicated to software design
and validation:
■ C Compiler
■ Simulator
■ Emulator
Applications
ST32F256 major applications include:
September 2009 Doc ID 15925 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
■ Mobile communications (GSM, 3G and CDMA)
■ Java Card™ applications
www.st.com
1
Description ST32F256
Ai12577
Internal Bus
I/O
IART
GND
Cortex™
M3
CPU
Core
2 x
16-bit
Timers
CRC
Module
CLK
Clock
Gene-
rator
Module
Vcc
Tr u e
Random
Number
Gene-
rator
RAM
ST ROM
Security
Adminis-
trator
RESET
Flash
memory
DES
Accelerator
ST ROM
Firewall
1 Description
1.1 Hardware description
The ST32F256 is a serial access microcontroller designed for secure mobile applications
that incorporates the most recent generation of ARM processors for embedded systems. Its
Cortex™-M3 32-bit RISC core operating at a 20-MHz frequency brings great performance
and excellent code compacity to the application thanks to the Thumb®-2 instruction set.
The high-speed embedded Flash 256 Kbyte memory introduces more flexibility to the
system.
The ST32F256 also offers a serial communication interface fully compatible with the ISO
7816-3 standard (T=0, T=1) for smartcard applications.
Two general purpose 16-bit timers are available.
A hardware Data Encryption Standard (DES) accelerator can be used to the user to
optimize the application performance. A software library is provided for Advanced
Encryption Standard (AES) implementation.
The ST32F family operates in the –25 to +85°C temperature range and 1.8V, 3V and 5V
supply voltage ranges. A comprehensive range of power-saving modes enables the design
of efficient low-power applications.
Figure 1. ST32F256 block diagram
2/4 Doc ID 15925 Rev 1
ST32F256 Revision history
1.2 Software development tools description
Dedicated Cortex™-M3 software development tools are provided by ARM and Keil. This
includes the Instruction Set Simulator (ISS) and C compiler. The documentation is available
on the ARM and Keil web sites.
Moreover, STMicroelectronics provides:
● A time-accurate hardare emulator controlled by the Keil debugger and the ST
development environment.
● A complete product simulator based on Keil’s ISS simulator for the Cortex™-M3 CPU.
● A ROMed Flash Loader with very high-speed software downloading capabilities.
2 Revision history
Table 1. Document revision history
Date Revision Changes
18-Sep-2009 1 Initial release.
Doc ID 15925 Rev 1 3/4
ST32F256
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2009 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
4/4 Doc ID 15925 Rev 1
Loading...