AN1313 - APPLICATION NOTE

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5.1.2.2 - Software Impacts

To have on the ST10F269 a behavior equivalent to the ST10F168’s one, POCONx values must be set to

the following:

– 0x0044h for POCON0L, POCON0H, POCON1L, POCON1H, POCON4, POCON5, POCON6,

POCON7, POCON8 and POCON20,

– 0x4444h for POCON2 and POCON3.

5.2 - New Registers not Impacting the Application

5.2.1 - ODP4 Register (F1CAh / E5h)

This is a new register of the ST10F269. For CAN configuration support, Port 4 has a new open drain

function controlled with this register.

5.2.2 - EXISEL Register (F1DAh / DAh)

This register, standing for External Interrupt Source Selection, has been added in the ST10F269.

The purpose of this new register is to select the interrupt sources of the fast external interrupts among the

other peripherals. For example the CANy controller receive signal (CANy_RxD) can be used to interrupt

the system (y = 1,2).