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SYSCFG external interrupt configuration register 1 SYSCFG_EXTICR1 EXTI中断0,1,2,3引脚选择 |
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| EXTIx[3:0]: EXTI x configuration (x = 0 to 3) |
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0000: PA[x] pin 0001: PB[x] pin 0010: PC[x] pin 0011: PD[x] pin 0100: PE[x] pin 0101: Reserved 0110: Reserved 0111: PH[x] pin
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SYSCFG_EXTICR2 配置 EXTI4，5，6，7
SYSCFG_EXTICR3 配置 EXTI8，9，10，11
SYSCFG_EXTICR4 配置EXTI12，13，14，15
| EXTI_IMR |
Interrupt mask register 中断屏蔽寄存器 |
MRx 0 : x is masked 1 : x is not masked |
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| EXTI_EMR |
Event mask register 事件屏蔽寄存器 |
MRx 0：x is masked 1： x is not masked |
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| EXTI_RTSR |
Rising trigger selection register 上升沿触发选择寄存器 |
TRx 0: Rising trigger disabled (for Event and Interrupt) for input line 1:Rising trigger enabled (for Event and Interrupt) for input line |
可以同时设置上升下降沿
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| EXTI_FTSR |
Falling trigger selection register 下降沿触发选择寄存器 |
TRx 0: Falling trigger disabled (for Event and Interrupt) for input line |
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| EXTI_SWIER |
Software interrupt event register 软件中断事件寄存器 |
SWIERx 为0时 写1 产生中断 为1时 写1 清除该位为0 |
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| EXTI_PR |
Pending register 挂起寄存器 |
PRx 0: No trigger request occurred 发生边沿事件，该位被置1 写1清除 |
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