AN413 datasheet(1/45 Pages) STMICROELECTRONICS

Part #	AN413

Description	Initialization of the ST9

PDF	45 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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November 2011

Doc ID 1875 Rev 2

1/45

AN413

Application note

Initialization of the ST9

1

Introduction

The ST9 family offers the microprocessor designer a wide variety of architectural features

configurable to the user’s specific application requirements. Central to all these

configurations is a multiple register based microcomputer core to which may be added on-

chip, powerful peripheral components including A/D converters, Serial Communication

Interface units (SCIs), and 16-bit Multifunction timers with input capture/output compare

capabilities. The availability, on-chip, of these application-specific units obviates the need for

external interface design as well as offering high-speed and good reliability.

The particular peripherals incorporated on-chip may themselves be individually configured

to offer a wide variety of functional (architectural) alternatives. This configuration is typically

implemented by simple software routines included in the power-on- or system- reset

routines. The sole difficulty which the user may initially encounter stems, in fact, from the

power and versatility of this approach to system design. The large number of available

options means that the user must specify a large number of system parameters by

initializing control register contents for the specific peripheral units.

The objective of this Application Note is to suggest to the user a programming structure and

philosophy to aid in the initial configuration of the system. The approach is illustrated by a

number of specific examples selected from the wide range available for the ST9030,

ST9040 families, but are applicable to all ST9s.

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