AN1780/1204

1/9

AN1780

APPLICATION NOTE

STR71X REAL TIME CLOCK APPLICATION EXAMPLE

INTRODUCTION

The purpose of this application note is to explain how to use the STR71x Real Time Clock

(RTC) peripheral. As an application example, it demonstrates how to setup the RTC periph-

eral, in terms of prescaler and interrupts, to be used to keep the time and date and to generate

Alarm interrupts

counters are designed to continuously count time in seconds. This application note addresses

how to convert the 32-bit time value into a date and time value that can be put in the following-

form MM/DD/YYYY, HH:MM:SS.

The date used in this application note is the same used with the UNIX operating system, the

reference date January 1, 1970, often referred to as Unix Epoch.

This document in organized in two sections, the first presents the STR71x RTC peripheral and

how to configure it and generate a fixed time base, the second part describes the related soft-

ware required for the application.

This application note deals with various techniques for keeping time with the STR71x.

For more information about the STR71x RTC peripheral refer to STR71x Reference Manual.

Note: Because of the reference date used and the use of a 32-bit counter, this algorithm rolls

over on Tuesday, January 19, 03:14:07, 2038.

The following application note developed using RVDK Toolchain V1.6.1 and the STR710 Eval-

board.

You must have the ARM Real View Developer Kit to get the most out of this Application Note.

1