Basic30 Language Reference
Interrupts

An interrupt handler is defined by placing one of the following keywords at the end of a normal Sub definition.

OscillatorFail	AddressError	StackError	MathError	INT0Interrupt	IC1Interrupt	OC1Interrupt	T1Interrupt
IC2Interrupt	OC2Interrupt	T2Interrupt	T3Interrupt	SPI1Interrupt	U1RXInterrupt	U1TXInterrupt	ADCInterrupt
NVMInterrupt	SI2CInterrupt	MI2CInterrupt	CNInterrupt	INT1Interrupt	IC7Interrupt	IC8Interrupt	OC3Interrupt
OC4Interrupt	T4Interrupt	T5Interrupt	INT2Interrupt	U2RXInterrupt	U2TXInterrupt	SPI2Interrupt	C1Interrupt
IC3Interrupt	IC4Interrupt	IC5Interrupt	IC6Interrupt	OC5Interrupt	OC6Interrupt	OC7Interrupt	OC8Interrupt
INT3Interrupt	INT4Interrupt	C2Interrupt	PWMInterrupt	QEIInterrupt	DCIInterrupt	LVDInterrupt	FLTAInterrupt
FLTBInterrupt

Context Saving:

The lower byte of the Status Register, W0 through W15, and CORCON.3 (IPL3) are saved and restored automatically. This adds 11 cycles of overhead when calling the interrupt, and 11 cycles when exiting from the interrupt.

Notes:

The interrupt flag must be cleared manually before leaving the handler.

Example:

Sub DivBy0Trap() MathError
    ' This routine will be executed whenever a math error occurs

    MathErr=0		' IMPORTANT!!! Always zero the interrupt flag before leaving

    ' HANDLE THE ERROR HERE !

End Sub