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ST72361AR4-Auto bảng dữ liệu(PDF) 56 Page - STMicroelectronics

tên linh kiện ST72361AR4-Auto
Giải thích chi tiết về linh kiện  Clock, reset and supply management
PDF  279 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST72361AR4-Auto bảng dữ liệu(HTML) 56 Page - STMicroelectronics

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Interrupts
ST72361xx-Auto
56/279
Doc ID 12468 Rev 3
6.6
External interrupts
6.6.1
I/O port interrupt sensitivity
The external interrupt sensitivity is controlled by the ISxx bits in the EICR register
(Figure 21). This control allows up to four fully independent external interrupt source
sensitivities.
Each external interrupt source can be generated on four (or five) different events on the pin:
●
Falling edge
●
Rising edge
●
Falling and rising edge
●
Falling edge and low level
To guarantee correct functionality, the sensitivity bits in the EICR register can be modified
only when the I1 and I0 bits of the CC register are both set to 1 (level 3). This means that
interrupts must be disabled before changing sensitivity.
The pending interrupts are cleared by writing a different value in the ISx[1:0] of the EICR.



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