SN8P1700
8-bit micro-controller build-in 12-bit ADC
MULTI-INTERRUPT OPERATION
In most conditions, the software designer uses more than one interrupt request. Processing multi-interrupt request
needs to set the priority of these interrupt requests. The IRQ flags of the 7 interrupt are controlled by the interrupt event
occurring. But the IRQ flag set doesn’t mean the system to execute the interrupt vector. The IRQ flags can be triggered
by the events without interrupt enable. Just only any the event occurs and the IRQ will be logic “1”. The IRQ and its
trigger event relationship is as the below table.
Interrupt Name
P00IRQ
Trigger Event Description
P0.0 trigger. Falling edge.
P0.1 trigger. Falling edge.
P0.2 trigger. Falling edge.
T0C overflow.
P01IRQ
P02IRQ
T0IRQ
TC0IRQ
TC1IRQ
SIOIRQ
TC0C overflow.
TC1C overflow.
End of SIO transmitter operating.
There are two things need to do for multi-interrupt. One is to make a good priority for these interrupt requests. Two is
using IEN and IRQ flags to decide executing interrupt service routine or not. Users have to check interrupt control bit
and interrupt request flag in interrupt vector. There is a simple routine as following.
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