ST10F271Z1 datasheet(54/185 Pages) STMICROELECTRONICS

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Interrupt system

ST10F271Z1

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available vector. If more than one source is enabled to issue the request, the service routine

will have to take care to identify the real event to be serviced. This can easily be done by

checking the flag bits (byte low of XIRxSEL register). Note that the flag bits can also provide

information about events which are not currently serviced by the interrupt controller (since

masked through the enable bits), allowing an effective software management also in

absence of the possibility to serve the related interrupt request: a periodic polling of the flag

bits may be implemented inside the user application.

Figure 9.

X-Interrupt basic structure

The Table 29 summarizes the mapping of the different interrupt sources which shares the

four X-interrupt vectors.

Table 29.

X-Interrupt detailed mapping

XP0INT

XP1INT

XP2INT

XP3INT

CAN1 interrupt

CAN2 interrupt

I2C receive

xxx

I2C transmit

xxx

I2C error

SSC1 receive

xxx

SSC1 transmit

xxx

SSC1 error

ASC1 receive

xxx

ASC1 transmit

xxx

ASC1 transmit buffer

xxx

XIRxSEL[7:0] (x = 0, 1, 2, 3)

XIRxSEL[15:8] (x = 0, 1, 2, 3)

XPxIC.XPxIR (x = 0, 1, 2, 3)

IT Source 7

IT Source 6

IT Source 5

IT Source 4

IT Source 3

IT Source 2

IT Source 1

IT Source 0

Enable[7:0]

Flag[7:0]

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