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ST72251

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

256 BYTES RAM, ADC, WDG, SPI, I

2

C AND 2 TIMERS

DATASHEET

s

s

s

s

s

s

s

s

s

s

s

s

s

s

s

s

s

User Program Memory (ROM/OTP/EPROM):

4 to 8K bytes

Data RAM: 256 bytes, including 64 bytes of

stack

Master Reset and Power-On Reset

Run, Wait, Slow and Halt modes

22 multifunctional bidirectional I/O lines:

鈥?22 programmable interrupt inputs

鈥?8 high sink outputs

鈥?6 Analog alternate inputs

鈥?16 Alternate Functions

鈥?EMI filtering

Programmable watchdog (WDG)

Two 16-bit Timers, each featuring:

鈥?2 Input Captures

鈥?2 Output Compares

鈥?External Clock input (on Timer A only)

鈥?PWM and Pulse Generator modes

Synchronous Serial Peripheral Interface (SPI)

Full I

2

C multiple Master/Slave interface

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

8-bit Data Manipulation

63 Basic Instructions

17 main Addressing Modes

8 x 8 Unsigned Multiply Instruction

True Bit Manipulation

Complete Development Support on PC/DOS-

WINDOWS

TM

Real-Time Emulator

Full Software Package on DOS/WINDOWS

TM

(C-Compiler, Cross-Assembler, Debugger)

PSDIP32

CSDIP32W

SO28

(See ordering information at the end of datasheet)

Device Summary

Features

Program Memory

- bytes

RAM (stack) - bytes

Peripherals

Operating Supply

CPU Frequency

Temperature Range

Package

ST72251G1

4K

256 (64)

Watchdog, Timers, SPI, I

2

C, ADC

3 to 5.5 V

8MHz max (16MHz oscillator)

4MHz max over 85擄C

- 40擄C to + 125擄C

SO28 - SDIP32

ST72251G2

8K

Rev.

1.9

June 2001

1/100

1

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