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hariprasad
hariprasad
Associate III
November 18, 2015
Question

STM32 stop mode and UART interrupt

  • November 18, 2015
  • 1 reply
  • 800 views
Posted on November 18, 2015 at 08:18

Hi

1. Can a UART receive interrupt wake the STM32 MCU from Stop mode (RX line start bit) ?

2. Only a External Interrupt can wake the STM32 MCU from low power modes ?

Regards

#!stm32f4-disco #low-power-stop-mode
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1 reply

waclawek.jan
waclawek.jan
Super User
November 18, 2015
Posted on November 18, 2015 at 10:14

> 1. Can a UART receive interrupt wake the STM32 MCU from Stop mode (RX line start bit) ?

1.2V-domain clocks are stopped in Stop mode, thus UART won't receive, thus no UART Rx interrupt occurs. OTOH, some STM32 models do have LPUART which may run during Stop mode. You did not mention the model/family you are using.

> 2. Only a External Interrupt can wake the STM32 MCU from low power modes ?

There are 3 low power modes, all of them have different options for wakeup. Read the fine manual's PWR section, Low-power modes sub-section.

JW

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