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AS3722 Datasheet(PDF) 74 Page - ams-OSRAM AG |
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AS3722 Datasheet(HTML) 74 Page - ams-OSRAM AG |
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74 / 199 page  ams Datasheet Page 73 [v1-01] 2015-Sep-07 Document Feedback AS3722 − Detailed Descriptions- System Functions Interrupt Generation Description The interrupt controller generates an interrupt request for the host controller as soon as one or more of the bits in the Interrupt 1…3 register are set by pulling low pin XINT. All the interrupt sources can be enabled in the Interrupt Mask 1…3 register. The Interrupt 1…3 registers are cleared automatically after the host controller has read them. To prevent the AS3722device from losing an interrupt event, the register that is read is captured before it is transmitted to the host controller via the serial interface. As soon as the transmission of the captured value is complete a logical AND operation with the bit wise inverted captured value is applied to the register to clear all interrupt bits that have already been transmitted. Clearing the read interrupt bits takes 2 clock cycles, a read access to the same register before the clearing process has completed will yield a value of ‘0’. Note that an interrupt that has been present at the previous read access will be cleared as well in case it occurs again before the clearing process has completed. |
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