Introduction
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.

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.

Typical applications for this family are:
• Automotive:
   ▪ Airbag
   ▪ ABS
   ▪ Gearbox
   ▪ Climate control
   ▪ Car radio
   ▪ Car navigation
• Communication:
   ▪ Cordless phones
   ▪ Cellular phones
   ▪ High speed modems
   ▪ High–end feature phones
   ▪ ISDN phones
   ▪ Line cards
   ▪ Network termination
• Computer:
   ▪ High–end monitors
   ▪ DVD–ROM
   ▪ Magtape card & smart card readers
   ▪ Barcodes readers
   ▪ Computer telephony
   ▪ Force feedback joysticks
• Industrial:
   ▪ Process monitoring control & readouts
   ▪ Air conditioning systems
   ▪ Automation

TEMIC’s TSC80251 derivatives are designed around the C251 core, using standard peripherals dedicated to a targetted range of applications.
Here is a selection of peripheral blocks:
• Serial interfaces:
   ▪ UART (Universal Asynchronous Receiver Transmitter)
   ▪ I2C (Inter–Integrated Circuit)
   ▪ SPI (Serial Protocol Interface)
   ▪ µWire (Synchronous Serial Interface)
• Special Functions:
   ▪ PCA: Programmable Counter Array (5x16–bit modules)
   ▪ High–speed output
   ▪ Compare/Capture I/O
   ▪ 8–bit Pulse Width Modulator (PWM)
   ▪ ADC (Analog to Digital Converter)
   ▪ Smart sensor interfaces with PMU (Pulse Measurement Unit)
• Control functions:
   ▪ Watchdog Timer
   ▪ Timers/Counters
   ▪ Power monitoring and management
   ▪ Interrupt handler
• Memories:
   ▪ RAM
   ▪ ROM
   ▪ EPROM/OTPROM
Most of TEMIC’s TSC80251 derivatives are available as ROMless, OTPROM, EPROM and Mask ROM version. For any special request, refer to TEMIC sales representative.