readme.txt

来自「STM32是以Cortex-M3为核的处理器」· 文本 代码 · 共 33 行

/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : readme.txt
* Author             : MCD Application Team
* Version            : V1.0
* Date               : 10/08/2007
* Description        : Description of the RTC Example.
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

Example description
===================
This example demonstrates and explains how to use the RTC peripheral. 
As an application example, it demonstrates how to setup the RTC peripheral, in terms
of prescaler and interrupts, to be used to keep time and to generate Second interrupt. 

The Low Speed External (LSE) clock is used as RTC clock source. 
The RTC clock can be output on the Tamper pin (PC.13). To enable this functionality,
uncomment the corresponding line: #define RTCClockOutput_Enable in the main.c file.

The RTC is in the backup (BKP) domain, still powered by VBAT when VDD is switched off,
so the RTC configuration is not lost if a battery is connected to the VBAT pin. 
A key value is written in backup data register1 (BKP_DR1) to indicate if the RTC
is already configured.

The program behaves as follows:
1. After startup the program checks the backup data register1 value: