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TSC80251

TSC 80251 Programmer’s Guide

Temic Semiconductors 

Introduction

TSC80251

1.1. 8/16–bit microcontroller

In the world of 8/16–bit microcontrollers, the C51 Architecture has become an industry standard for embedded

applications. For over 15 years, TEMIC has been a leading provider of this microcontroller family. This unsurpassed

experience is the driving force as TEMIC takes this proven family to the next level of performance: the TSC80251

family!

This new C251 Architecture at its lowest performance level (binary mode), is binary code compatible with the 80C51

microcontrollers, hence, attaining an increase in performance has never been easier.

Due to a 3–stage pipeline, the CPU–performance is increased by a factor 5, using existing C51 code without

modifications.

Using the new C251 instruction set, which you will find in this document (See Chapter 5), the performance will increase

up to 15 times at the same clock rate. This performance enhancement is based on the 16–bit instruction bus, allowing

for more powerful instructions and additional internal instruction bus, 8–bit and 16–bit data busses.

The 24–bit address bus will allow to access up to 16 Mbytes in a single linear memory space. Please see each individual

TSC80251 Product Design Guide for the effective addressable memory range.

Programming flexibility and C–code efficiency are both increased through a Register–based Architecture, the

64–Kbyte extended stack space combining with the new instruction set.

C251 C–compilers are some of the most efficient available (nearly no overhead), coupled with the final codesize which

could be a factor of 3 down when compared with the C51 C–compilers.

All technical information in this document about core features are related to the core revision A and core revision D.

1.2. TSC80251 Derivatives

TEMIC is developing a full family of application specific TSC80251 derivatives. Please see the Design Guide of each

product for further information.

These products are designed to help you getting high–performance products to market faster.

Due to the high instruction throughput, the TSC80251 derivatives are focussing on all high–end 8–bit to 16–bit

applications.

TSC80251 derivatives are also used in mid–range and lower–end microcontroller applications, where a very low

operation frequency is needed, without decreasing the level of CPU–power.

This feature is ideal for today portable applications and EMC sensitive systems.

Rev. C – May 7, 1999

1.1

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