PWR_STANDBY

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

This example shows how to enters the system to STANDBY mode and wake-up from this mode using: external RESET, RTC Alarm or WKUP pin.

In the associated software, 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), an EXTI line is configured to generate an interrupt on falling edge and the SysTick is programmed to generate an interrupt each 250 ms. In the SysTick interrupt handler, the LED1 is toggled, this is used to indicate whether the MCU is in STANDBY or RUN mode.

When a falling edge is detected on the EXTI line an interrupt is generated. In the EXTI handler routine the RTC is configured to generate an Alarm event in 3 second then the system enters STANDBY mode causing the LED1 to stop toggling. A rising edge on WKUP pin or an external RESET will wake-up the system from STANDBY. If within 3 second neither rising edge on WKUP pin nor external RESET are generated, the RTC Alarm will wake-up the system.

After wake-up from STANDBY mode, program execution restarts in the same way as after a RESET, the LED1 restarts toggling, LED2 is turned on and the RTC configuration (clock source, enable, prescaler,...) is kept. As result there is no need to configure the RTC.

Two leds LED1 and LED2 are used to monitor the system state as following:

Directory contents
Hardware and Software environment
Note:
For power consumption measurement in STANDBY mode, you have to replace jumper JP9 in the STM3210B-EVAL board, JP12 in the STM3210E-EVAL or JP23 (position 1-2) in the STM3210C-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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