ST7293 datasheet(48/69 Pages) STMICROELECTRONICS

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ST72E94 - ST72T94

1 GENERAL DESCRIPTION

1.1 INTRODUCTION

The ST72E94 and ST72T94 (following mentioned

as ST72E94) are EPROM members with EEP-

ROM of the ST72 family of microcontrollers, in

windowed ceramic (E) and plastic OTP (T) pack-

ages respectively, completely developed and pro-

duced by SGS-THOMSON Microelectronics using

n-well

proprietary

HCMOS

process.

The

EPROM parts are fully compatible with their ROM

versions and this datasheet will thus provide only

information specific to the EPROM based devices.

THE READER IS ASKED TO REFER TO THE

DATASHEET OF THE ST7294 AND ST7293

ROM-BASED DEVICES FOR FURTHER DE-

TAILS.

The ST72E94 is an user-programmable and eras-

able device. It is best suited for development. The

ST72T94 is a One-Time Programmable device

(OTP). It offers the best cost/flexibility trade-off for

prototyping and preseries as well as most low to

medium volume applications.

The ST72E94 and ST72T94 are HCMOS micro-

controllers from the ST72 family. They are based

around an 8-bit core industry standard and offers

an enhanced instruction set. The processor runs

with an external clock at 4 MHz with a 5V supply

and 2MHz with a 3V supply. Due to the fully static

design of this device, operation down to DC is

possible. Under software control the ST72E94

and ST72T94 can be placed in WAIT or HALT

mode thus reducing power consumption. The en-

hanced instruction set and addressing modes af-

ford real programming potential. In addition to

standard 8 bit data management the ST72E94

and ST72T94 feature true bit manipulation, 8x8

unsigned multiplication and indirect addressing

modes. The devices include an on-chip oscillator,

CPU, EPROM, RAM, EEPROM, I/O, and one tim-

er with 1 input capture and 2 output compare sys-

tems.

Figure 2. ST72E94 Block Diagram

Note 1. EPROM version only

CONTROL

PORT A

PORT B

PORT C

TIMER SYSTEM

RAM

224 Bytes

ROM or EPROM(1)

6144 kbytes

PA0 - PA7

(8-Bit)

PB0 - PB7

(8-Bit)

PC0 - PC5

(6-Bit)

OSCin

OSCout

INT/V

(1)

RESET

OSCILLATOR

POWER

SUPPLY

8 -BIT CORE

ALU

VR01735E

Internal

CLOCK

WATCHDOG

EEPROM

256 Bytes

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