ST9 datasheet(7/146 Pages) STMICROELECTRONICS

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ST9 USER GUIDE

2 INTRODUCING THE ST9 BASICS

The ST9 microcontroller family has a common processor core surrounded by a range of pow-

erful peripherals for interfacing with many different devices. The peripherals have sufficient

built-in intelligence to be able to perform even complex jobs on their own, freeing the core al-

most entirely from I/O handling. The core can thus be fully utilized for classical micropro-

cessing tasks.

The ST9 architecture is an original STMicroelectronics design, with the objective of providing

an innovative and efficient microcontroller architecture dedicated to real-time control.

2.1 PROCESSOR CORE

When you compare different microcontrollers, you can estimate the relative computing power

of the core, and also of the peripherals (if they include some intelligence). In some architec-

tures, the peripherals make heavy use of the core and thus take up a part of its computing

power. Many microcontrollers available on the market have a relatively powerful core, sur-

rounded by very simple peripherals. This approach has the advantage of making the periph-

erals easy to use and configure, but at the expense of the overall computing power.

The ST9 is an example of a radically different compromise. Its core is among the best 8-bit mi-

croprocessors on the market in terms of computing performance and system management ca-

pabilities. It is assisted (rather than just surrounded) by peripheral blocks of which most can

perform complex tasks without the intervention of the core. The net result is a powerful ma-

chine that can even perform impressive tasks just using its peripherals. The three applications

described in this book give meaningful examples of processes handled solely by the periph-

erals.

The ST92F150 is the latest generation of the powerful ST9 microprocessor family. The new

ST9 core executes software more than three times faster than the previous ST9 core using

optimized instructions and up to double the CPU frequency. The core as well as many periph-

erals have been enhanced, like for example, the Memory Management Unit (MMU), which is

now more flexible, with a single 4-Mbyte memory space that is directly accessible without

using bank switching. Another example is the Reset and Clock Control Unit (RRCU) which has

added features for reducing power-consumption.

The ST9 is a register-oriented machine. This means that a large number of registers is avail-

able in the core; but above all, this implies that the instruction set is tailored to make efficient

use of its registers through optimized addressing modes. It is also well suited to the use of C

language.

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