T410 datasheet(7/84 Pages) STMICROELECTRONICS

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ST52T410/T420/E420

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1 GENERAL DESCRIPTION

1.1 Introduction

ST52T410/ST52x420 are 8-bit Intelligent Control

Units (ICU) of the ST Five Family, which can

perform both boolean and fuzzy algorithms in an

efficient manner, in order to reach the best

performances that the two methodologies allow.

S T 5 2 T 410 / S T 5 2x 42 0

a re

p r odu c e d

b y

ST M i croel ec tro ni cs usi ng the re li abl e hi gh

performance CMOS process, including integrated-

on-chip peripherals that allow maximization of

system reliability, decreasing system costs and

minimizing the number of external components.

The flexible I/O configuration of ST52x400/440

allows for an interface with a wide range of external

devices, like D/A converters or power control

devices.

ST52T 410/ST52x420 pins are configurable,

allowing the user to set the input or output signals

on each single pin.

A hardware multiplier (8 bit by 8 bit with 16 bit

result) and a divider (16 bit over 8 bit with 8 bit

result and 8 bit rem ainder) are availabl e to

implement complex functions by using a single

instruction. The program memory utilization and

computational speed is optimized.

Fuzzy Logic dedicated structures in ST52T410/

ST 52x420 ICU’ s can be exploi ted to m odel

complex systems with high accuracy in a useful

and easy way.

F u zzy Exp e r t S yste m s f o r o v e r a l l syste m

management and fuzzy Real time Controls can be

designed to increase performances at highly

competitive costs.

The linguistic approach characterizing Fuzzy Logic

is based on a set of IF-THEN rules, which describe

the control behavior, as well as on Membership

Functions, which are associated to input and

output variables.

Up to 334 Membership Functions, with triangular

and trapezoidal shapes, or singleton values are

available to describe fuzzy variables.

T h e T i m er / P W M pe ri ph era l al l o ws t h e

management of power devices and timing signals,

implementing different operating modes and high

frequency PWM (Pulse With Modulation) controls.

Input Capture and Output Compare functions are

available on the TIMER.

The programmable Timer has a 16 bit Internal

Prescaler and an 8 bit Counter. It can use internal

or external Start/Stop signals and clock.

An internal programmable Watchdog is available

to avoid loop errors and to reset the ICU.

ST52x420 includes an 8-bit Analog to Digital

Converter with an 8-analog channel Multiplexer.

Single/Multiple channels and Single/Sequence

conversion modes are supported.

In order to optimize energy consumption, two

different power saving modes are available: Wait

mode and Halt mode.

Program Memory (EPROM/OTP) addressing

capability addresses up to 8 Kbytes of memory

locations to store both program instructions and

permanent data.

EPROM can be locked by the user to prevent

external undesired operations.

Operations may be performed on data stored in

RAM, allowing the direct combination of new input

and feedback data. All bytes of RAM are used like

OTP (One Time Programmable) version devices

are fully compatible with the EPROM windowed

version, which may be used for prototyping and

pre-production phases of development.

A powerful development environment consisting of

a b oard a nd software too ls al low s a n easy

configuration and use of ST52T410/ST52x420.

T h eVI S U A LF I V ETM s o f twa re t ool al l o ws

development of projects through a user-friendly

graphical interface and optimization of generated

code.

1.2 Functional Description

ST5 2T410/ST52x420 ICUs can work in two

modes:

Memory Programming Mode

Working Mode

according to RESET and Vpp signals levels (see

pins description).

Note: When RESET=0 it is advisable not to use

the sequence “101010“ to port PA (7 : 2).

1.2.1 Memory Programming Mode.

The ST52T410/ST52x420 memory is loaded in the

M emory Programm ing Phase. All fuzzy and

standard instructions a re written insid e the

memory.

This phase starts by setting the control signals as

illustrated below:

RESET

TEST

VPP

Vss

12V/VDD

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