ST7MC2S4-Auto datasheet(60/371 Pages) STMICROELECTRONICS

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Interrupts

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Figure 16.

Interrupt processing flowchart

7.2.1

Servicing pending interrupts

As several interrupts can be pending at the same time, the interrupt to be taken into account

is determined by the following two-step process:

●

the highest software priority interrupt is serviced,

●

if several interrupts have the same software priority then the interrupt with the highest

hardware priority is serviced first.

Figure 17 describes this decision process.

Table 16.

Interrupt software priority levels

Interrupt software priority

Level

Level 0 (main)

Low

High

Level 1

Level 2

Level 3 (interrupt disable)

‘IRET’

Restore PC, X, A, CC

Stack PC, X, A, CC

Load I1:0 from interrupt SW reg.

Fetch next

Reset

MCES

Pending

instruction

I1:0

from stack

Load PC from interrupt vector

Interrupt has the same or a

lower software priority

The interrupt

stays pending

than current one

Interrupt has a higher

software priority

than current one

Execute

instruction

interrupt

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