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ST72E121

ST72T121

8-BIT MCU WITH 8 TO 16K OTP/EPROM,

384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS

DATASHEET

s

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s

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s

s

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s

s

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s

s

s

User Program Memory (OTP/EPROM):

8 to 16K bytes

Data RAM: 384 to 512 bytes including 256 bytes

of stack

Master Reset and Power-On Reset

Low Voltage Detector (LVD) Reset option

Run and Power Saving modes

32 multifunctional bidirectional I/O lines:

鈥?9 programmable interrupt inputs

鈥?4 high sink outputs

鈥?13 alternate functions

鈥?EMI filtering

Software or Hardware Watchdog (WDG)

Two 16-bit Timers, each featuring:

鈥?2 Input Captures

1)

鈥?2 Output Compares

1)

鈥?External Clock input (on Timer A)

鈥?PWM and Pulse Generator modes

Synchronous Serial Peripheral Interface (SPI)

Asynchronous Serial Communications Interface

(SCI)

8-bit Data Manipulation

63 basic Instructions and 17 main Addressing

Modes

8 x 8 Unsigned Multiply Instruction

True Bit Manipulation

Complete Development Support on DOS/

WINDOWS

TM

Real-Time Emulator

Full Software Package on DOS/WINDOWS

TM

(C-Compiler, Cross-Assembler, Debugger)

PSDIP42

CSDIP42W

TQFP44

(See ordering information at the end of datasheet)

Note: 1.

One only on Timer A.

Device Summary

Features

Program Memory - bytes

RAM (stack) - bytes

Peripherals

Operating Supply

CPU Frequency

Temperature Range

Package

OTP/EPROM Devices

ST72T121J2

ST72T121J4

8K

16K

384 (256)

512 (256)

Watchdog, Timers, SPI, SCI and optional Low Voltage Detector Reset

3 to 5.5 V

8MHz max (16MHz oscillator) - 4MHz max over 85擄C

- 40擄C to + 125擄C

TQFP44 - SDIP42

ST72T121J4/ST72E121J4

Note:

The ROM versions are supported by the ST72124 family.

Rev. 1.7

September 1999

1/92

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