Cypress FM4 Series - Interrupt Factors

CHAPTER 2-1: Clock
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 49
3.5 Interrupt Factors
This section explains interrupt factors relevant to clocks.
The clock generation unit has the following interrupt factors.
Interrupt Factors
The clock generation unit has the following four types of interrupt factors:
− FCS (anomalous frequency detection) interrupt
When the FCS (anomalous frequency detection) is enabled, and an anomalous frequency of the
main clock is detected, an interrupt occurs.
− Main PLL clock oscillation stabilization wait completion interrupt
When the main PLL clock oscillation stabilization wait time ends, an interrupt occurs.
− Sub clock oscillation stabilization wait completion interrupt
When the sub clock oscillation stabilization wait time ends, an interrupt occurs.
− Main clock oscillation stabilization wait completion interrupt
When the main clock oscillation stabilization wait time ends, an interrupt occurs.
Registers
The following three types of registers are provided for each interrupt factor:
− Interrupt Enable Register (INT_ENR)
This register enables each interrupt.
− Interrupt Status Register (INT_STR)
This register indicates each interrupt status. This register is read-only.
− Interrupt Clear Register (INT_CLR)
This register clears each interrupt factor. This register is write-only.