ST52T301 datasheet(6/100 Pages) STMICROELECTRONICS

6 / 100 page

2 INTERNAL ARCHITECTURE

ST52x301 is made up by the following blocks and

peripherals:

Control Unit

Fuzzy Core

ALU

EPROM

Clock Oscillator

Analog Multiplexer and A/D Converter

Prescaler Timer

Bandgap

Triac / PWM Driver

Digital I/O port

Serial Communication Interface

ST52x301 Operating Modes

ST52x301 works in two modes, Programming and

Working Modes, depending on the control signals

level RESET, TEST and MODE.

The Operating modes are selected by setting the

control signal level as specified in the Control

Signals Setting table.

2.1 CONTROL UNIT

The Control Unit (CU) manages: Registers File,

Input Registers, Configuration Registers, ALU,

Accumulator and Multiplexer inputs. Moreover the

CU drives the Fuzzy Core and the peripherals

(Triac/PWM Driver and Timer).

The CU reads the stored instructions on the

EPROM (Fetch) and decodifies them. If the

instructions are arithmetic or logic, the CU runs

them directly, sending the control signals to the

related blocks. If there is a STOP instruction, the

CU transfers the control to the Fuzzy Core.

The Fuzzy Core (FC) will read the next instruction

(that must be a fuzzy instruction)from the EPROM.

The FC mantains the control of the program until

the next STOP instruction. Then the FC transfers

the control to the CU.

These characteristicsallow to mix fuzzy algorithms

with mathematical and logic instructions.

Figure 2.1 shows a flow-chart reasuming the logic

behaviour of the instructions management.

Control

Sign al

Programming

Reset

Working

RESET

TEST

MODE

Table 2.1. Control Signals setting

Reads fromthe EPROM

and

Decodifies the instruction

executes instruction

Fuzzy Core

Reads fromthe EPROM

and

Decodifies the instruction

STOP?

Fuzzy Core

executes instruction

Yes

Figure 2.1. Computation Algorithm Flow Chart

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ST52T301/E301

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