ST10F273E datasheet(55/179 Pages) STMICROELECTRONICS

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ST10F273E

Interrupt system

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When different sources submit an interrupt request, the enable bits (Byte High of XIRxSEL

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 7.

X-Interrupt basic structure

The

Table 30 summarizes the mapping of the different interrupt sources which shares the

four X-interrupt vectors.

Table 30.

X-Interrupt detailed mapping

XP0INT

XP1INT

XP2INT

XP3INT

CAN1 interrupt

CAN2 interrupt

I2C receive

I2C transmit

I2C error

SSC1 receive

SSC1 transmit

SSC1 error

ASC1 receive

ASC1 transmit

ASC1 transmit buffer

ASC1 error

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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