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STMicroelectronics Electronic Components Datasheet

ST72C254G Datasheet

(ST72CxxxG) 8-BIT MCU

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ST72104G, ST72215G,

ST72216G, ST72254G

8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY,

ADC, 16-BIT TIMERS, SPI, I2C INTERFACES

PRELIMINARY DATA

s Memories

– 4K or 8K bytes Program memory (ROM and

single voltage FLASH) with read-out protec-

tion and in-situ programming (remote ISP)

– 256 bytes RAM

s Clock, Reset and Supply Management

– Enhanced reset system

– Enhanced low voltage supply supervisor with

3 programmable levels

– Clock sources: crystal/ceramic resonator os-

cillators or RC oscillators, external clock,

backup Clock Security System

– Clock-out capability

– 3 Power Saving Modes: Halt, Wait and Slow

s Interrupt Management

– 7 interrupt vectors plus TRAP and RESET

– 22 external interrupt lines (on 2 vectors)

s 22 I/O Ports

– 22 multifunctional bidirectional I/O lines

– 14 alternate function lines

– 8 high sink outputs

s 3 Timers

– Configurable watchdog timer

– Two 16-bit timers with: 2 input captures, 2 out-

put compares, external clock input on one tim-

er, PWM and Pulse generator modes

(one only on ST72104Gx and ST72216G1)

s 2 Communications Interfaces

– SPI synchronous serial interface

– I2C multimaster interface

(only on ST72254Gx)

s 1 Analog peripheral

– 8-bit ADC with 6 input channels

(except on ST72104Gx)

SDIP32

SO28

s Instruction Set

– 8-bit data manipulation

– 63 basic instructions

– 17 main addressing modes

– 8 x 8 unsigned multiply instruction

– True bit manipulation

s Development Tools

– Full hardware/software development package

Device Summary

Features

Program memory - bytes

RAM (stack) - bytes

Peripherals

Operating Supply

CPU Frequency

Operating Temperature

Packages

ST72104G1

ST72104G2

ST72216G1

ST72215G2

ST72254G1

ST72254G2

4K 8K 4K 8K 4K 8K

256 (128)

Watchdog timer,

One 16-bit timer,

SPI

Watchdog timer, Watchdog timer,

One 16-bit timer, Two 16-bit timers,

SPI, ADC

SPI, ADC

Watchdog timer,

Two 16-bit timers,

SPI, I C, ADC

3.2V to 5.5V

Up to 8 MHz (with oscillator up to 16 MHz)

0°C to 70°C / -10°C to +85°C (-40°C to +85°C / -40°C to105°C / -40°C to 125°C optional)

SO28 / SDIP32

Rev. 2.6

November 2000

1/140

This is preliminary information on a new product in development or undergoing evaluation. Details are subject to change without notice.

1

STMicroelectronics Electronic Components Datasheet

ST72C254G Datasheet

(ST72CxxxG) 8-BIT MCU

No Preview Available !

www.DataSheet4U.com

Table of Contents

1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 REGISTER & MEMORY MAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4 FLASH PROGRAM MEMORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2 MAIN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.3 STRUCTURAL ORGANISATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.4 IN-SITU PROGRAMMING (ISP) MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.5 MEMORY READ-OUT PROTECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5 CENTRAL PROCESSING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2 MAIN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.3 CPU REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6 CENTRAL PROCESSING UNIT (Cont’d) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7 SUPPLY, RESET AND CLOCK MANAGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7.1 LOW VOLTAGE DETECTOR (LVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.2 RESET SEQUENCE MANAGER (RSM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.2.2 Asynchronous External RESET pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.2.3 Internal Low Voltage Detection RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.2.4 Internal Watchdog RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.3 MULTI-OSCILLATOR (MO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7.4 CLOCK SECURITY SYSTEM (CSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.4.1 Clock Filter Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.4.2 Safe Oscillator Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.4.3 Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.4.4 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.5 CLOCK RESET AND SUPPLY REGISTER DESCRIPTION (CRSR) . . . . . . . . . . . . . . . 23

7.6 MAIN CLOCK CONTROLLER (MCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

8 INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

8.1 NON MASKABLE SOFTWARE INTERRUPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

8.2 EXTERNAL INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

8.3 PERIPHERAL INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

9 POWER SAVING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

9.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

9.2 SLOW MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

9.3 WAIT MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

9.4 HALT MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

10 I/O PORTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

10.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

10.2 FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

10.2.1Input Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. 4. 0. . 30

10.2.2Output Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2/140

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Part Number	ST72C254G
Description	(ST72CxxxG) 8-BIT MCU
Maker	STMicroelectronics
Total Page	30 Pages
PDF Download	ST72C254G Datasheet PDF	View PDF for Mobile

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