ST72561AR7-Auto datasheet(53/324 Pages) STMICROELECTRONICS

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ST72561-Auto

Interrupts

Doc ID 12370 Rev 8

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if the corresponding enable bit is set in the peripheral control register.

The general sequence for clearing an interrupt is based on an access to the status register

followed by a read or write to an associated register.

Note:

The clearing sequence resets the internal latch. A pending interrupt (that is, waiting for

being serviced) will therefore be lost if the clear sequence is executed.

6.3

Interrupts and low power modes

All interrupts allow the processor to exit the WAIT low power mode. On the contrary, only

external and other specified interrupts allow the processor to exit from the HALT modes (see

column “Exit from HALT” in “Interrupt Mapping” table). When several pending interrupts are

present while exiting HALT mode, the first one serviced can only be an interrupt with exit

from HALT mode capability and it is selected through the same decision process shown in

Figure 18.

Note:

If an interrupt, that is not able to Exit from HALT mode, is pending with the highest priority

when exiting HALT mode, this interrupt is serviced after the first one serviced.

6.4

Concurrent & nested management

The following Figure 19 and Figure 20 show two different interrupt management modes. The

first is called concurrent mode and does not allow an interrupt to be interrupted, unlike the

nested mode in Figure 20. The interrupt hardware priority is given in this order from the

lowest to the highest: MAIN, IT4, IT3, IT2, IT1, IT0, TLI. The software priority is given for

each interrupt.

Warning:

A stack overflow may occur without notifying the software of

the failure.

Figure 19.

Concurrent interrupt management

MAIN

IT4

IT2

IT1

TLI

IT1

MAIN

IT0

SOFTWARE

3/0

11 / 10

RIM

IT3

PRIORITY

LEVEL

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