
Si5040
Rev. 1.3 37
11. Interrupt Functionality
Alarm Status bits (Register 9/137) are sampled by a 10 MHz clock to create the Interrupt Status bits (Register
5/133). If the Interrupt Enable bit (Register 2, bit 5) is a zero, all the Interrupt status bits are forced to zero. The
Alarm Status bits are always active regardless of the state of the Interrupt Enable bit and the Interrupt Mask bits.
The Interrupt Mask bits (Register 4/132) masks the Alarms Status bits from affecting the corresponding Interrupt
Status bit. Writing a zero to an Interrupt Status bit forces that bit to a zero; however, if the corresponding Alarm bit
is active and the Interrupt Mask bit is not set, the next 10 MHz clock cycle will again cause the Interrupt Status bit to
set. All of the Interrupt Status bits are logically “NORed” together to create the Interrupt bit (or pin16). Please refer
to Figure 23 for an illustration of the device interrupt tree. The polarity of the Interrupt (pin 16) is active low.
Comentarios a estos manuales