PWR_STOP

  ******************** (C) COPYRIGHT 2010 STMicroelectronics *******************
  * @file    PWR/STOP/readme.txt 
  * @author  MCD Application Team
  * @version V3.4.0
  * @date    10/15/2010
  * @brief   Description of the PWR STOP Example.
  ******************************************************************************
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Example Description

This example shows how to enter the system to STOP mode and wake-up using EXTI Line interrupts. The EXTI Line sources are PB.09/PG.08 and RTC Alarm.

The EXTI line9/8 is configured to generate interrupt on falling edge. The EXTI line17(RTC Alarm) is configured to generate interrupt on rising edge and the RTC time base is set to 1 second using the external low speed oscillator(LSE).

The system clock is set to 24 MHz on Value line devices and to 72 MHz on other devices using the external high speed oscillator(HSE).

The system enters and exits STOP mode as following: After 2 second from system start-up, the RTC is configured to generate an Alarm event in 3 second then the system enters STOP mode. To wake-up from STOP mode you have to apply a rising edge on EXTI line9/8, otherwise the RTC Alarm will wake-up the system within 3 second. After exit from STOP the system clock is reconfigured to its previous state (as HSE and PLL are disabled in STOP mode). Then after a delay the system will enter again in STOP mode and exit in the way described above. This behavior is repeated in an infinite loop.

Three leds LED1, LED2 and LED3 are used to monitor the system state as following:

Directory contents
Hardware and Software environment
Note:
For power consumption measurement in STOP mode you have to:
  • Modify the example to configure all unused GPIO port pins in Analog Input mode (floating input trigger OFF). Refer to GPIO example for more details.
  • Replace jumper JP9 in the STM3210B-EVAL board, JP12 in the STM3210E-EVAL, JP23 (position 1-2) in the STM3210C-EVAL board or JP8 (position 1-2) in the STM32100B-EVAL board by an ampermeter.
How to use it ?

In order to make the program work, you must do the following :

Tip: You can tailor the provided project template to run this example, for more details please refer to "stm32f10x_stdperiph_lib_um.chm" user manual; select "Peripheral Examples" then follow the instructions provided in "How to proceed" section.

Note:
  • Low-density Value line devices are STM32F100xx microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
  • Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
  • Medium-density Value line devices are STM32F100xx microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
  • Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
  • High-density Value line devices are STM32F100xx microcontrollers where the Flash memory density ranges between 256 and 512 Kbytes.
  • High-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 256 and 512 Kbytes.
  • XL-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 512 and 1024 Kbytes.
  • Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.

© COPYRIGHT 2010 STMicroelectronics

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