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ST72251

8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI, I2C AND 2 TIMERS

STMicroelectronics 

ST72251

8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM,

256 BYTES RAM, ADC, WDG, SPI, I2C AND 2 TIMERS

DATASHEET

s User Program Memory (ROM/OTP/EPROM):

4 to 8K bytes

s Data RAM: 256 bytes, including 64 bytes of

stack

s Master Reset and Power-On Reset

s Run, Wait, Slow and Halt modes

s 22 multifunctional bidirectional I/O lines:

– 22 programmable interrupt inputs

– 8 high sink outputs

– 6 Analog alternate inputs

– 16 Alternate Functions

– EMI filtering

s Programmable watchdog (WDG)

s Two 16-bit Timers, each featuring:

– 2 Input Captures

– 2 Output Compares

– External Clock input (on Timer A only)

– PWM and Pulse Generator modes

s Synchronous Serial Peripheral Interface (SPI)

s Full I2C multiple Master/Slave interface

s 8-bit Analog-to-Digital converter (6 channels)

s 8-bit Data Manipulation

s 63 Basic Instructions

s 17 main Addressing Modes

s 8 x 8 Unsigned Multiply Instruction

s True Bit Manipulation

s Complete Development Support on PC/DOS-

WINDOWSTM Real-Time Emulator

s Full Software Package on DOS/WINDOWSTM

(C-Compiler, Cross-Assembler, Debugger)

PSDIP32

CSDIP32W

SO28

(See ordering information at the end of datasheet)

Device Summary

Features

ST72251G1 ST72251G2

Program Memory

- bytes

4K

8K

RAM (stack) - bytes

256 (64)

Peripherals

Watchdog, Timers, SPI, I2C, ADC

Operating Supply

3 to 5.5 V

CPU Frequency

8MHz max (16MHz oscillator)

4MHz max over 85°C

Temperature Range

- 40°C to + 125°C

Package

SO28 - SDIP32

Rev. 1.9

June 2001

1/100

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