13年電子設(shè)計大賽培訓(xùn)cortex-m09.外部中斷

1、EXTI特性Pending Request Registererrupt Mask RegisterSoftware errupt Event RegisterRising TriggerSelection RegisterFalling TriggerSelection Register管理外部和的異步事件/中斷并產(chǎn)生事件請求送到中斷控制器；以及喚醒請求送到功耗管理模塊Edge Detect CircuitToNVIC某些通信外設(shè)（UART、I2C、CEC、比較器）能在MCU處于停止模式時產(chǎn)生喚醒事件來把MCU喚醒Pulse GeneratorEvent Mask RegisterUp to

2、 28errupt/Events requests :Up to 55 GPIOs can be used as EXTI line(0.15) EXTI line 16 is connected to the PVD outputEXTI line 17 is connected to the RTC Alarm eventEXTI line 18 is(ernally held low)EXTI line 19 is connected to RTC ter and Timests其他特性和STM32F1x系列一樣EXTI line 20 is(ernally held low)EXTI

3、line 21 is connected to Comparator 1 output EXTI line 22 is connected to Comparator 2 output EXTI line 23 is connected to I2C1 wakeupEXTI line 24 is(ernally held low)EXTI line 25 is connected to USART1 wakeupEXTI line 26 is(ernally held low)EXTI line 27 is connected to CEC wakeup.1EXTI15:0擴展的中斷/事件控制

4、器28個中斷/事件請求外部中斷/事件線：21條中斷/事件線：7條（其中4個保留）I2C1喚醒、USART1喚醒、CEC喚醒僅在STOP模式下，以上三個線才起作用中斷事件設(shè)置希望檢測的邊沿RTSR、FTSR；設(shè)置中斷掩碼來使能中斷請求IMR；配置NVIC相應(yīng)通道一旦邊沿到來，產(chǎn)生中斷請求并置位掛起位設(shè)置希望檢測的邊沿RTSR、FTSR；使能事件請求EMR；一旦所選邊沿到來，產(chǎn)生事件脈沖，不會置位掛起位外部線總是檢測上升沿；中斷請求被默認(rèn)使能； 中斷到來后并無掛起標(biāo)志線事件是一個簡單脈沖，用來觸發(fā)內(nèi)核喚醒（線的掛起在它自己的IP寄存器中）1.對于外部線，還可產(chǎn)生中斷/事件；線則注意2.線只有在STOP模式下才能產(chǎn)生中斷/事件；非STOP模式下線被自動關(guān)閉2寄存器組：中斷、事件掩碼配置線默認(rèn)產(chǎn)生中斷，也可以配置產(chǎn)生事件3寄存器組：邊沿選擇可以同時選擇上升沿和下降沿外部線可由用戶配置檢測的邊沿；線固定檢測上升沿4寄存器組：觸發(fā)和掛起狀態(tài)當(dāng)位為0時，置1會硬件置位掛起狀態(tài)位；如果該外部線使能了中斷掩碼，則產(chǎn)生中斷請求產(chǎn)生中斷，只針對外部線掛起狀態(tài)位只針對外部線5QuizHow many lines does have the Extendedsupport?errupt controllerWhich lines are mappe