ST10F276Z5 registers not supported by the emulator

AN2695

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ST10F276Z5 registers not supported by the emulator

This section describes all the emulation issues caused by the non-implementation of some

ST10F276Z5 registers in the ST10 bond-out and ST10F276Z5 emulators.

3.1

Software advice for non-implemented registers

When an ST10F276Z5 register is not implemented in the bond-out:

●

avoid unnecessary data read and check operations in this register

●

if some read accesses in user mode are necessary, use the CPU IDCHIP register to

detect which CPU is running the code. Then, allow the check on this register only for

the ST10F276Z5. If running from the bond-out, use a predefined, but non-initialized,

memory variable to set the desired configuration during emulation.

3.2

Port4 registers

Description: the ST10F276Z5 ODP4 register is not implemented on the ST10 bond-out.

This register is used to set the CAN-TxD pin handling alternate functions in push-pull or

open-drain. Usually, the open drain configuration on the CAN-TxD lines is used to put two

CAN modules in parallel.

Software impact: application software should only write to this register.

Hardware impact: no hardware impact if ST’s advice is implemented by the emulator party

(check with your emulator supplier).

ST10F276Z5 emulation impact: no impact if ST’s advice is implemented and if the

contents of the register are fixed at initialization (never changed during run time) and if the

emulator is properly configured.

Hint: use the CANPAR bit in the XMISC register to configure the two modules in parallel.

Note:

This limitation is already present in the ST10F269Zx.

3.3

Port5 registers

Description: the ST10F276Z5 P5DIDIS register is not implemented in the emulator. This

register is used to enhance the accuracy of analog inputs within the temperature and supply

voltage ranges.

Software impact: application software should only write to this register.

ST10F276Z5 emulation impact: no impact if software recommendations are used.

Note:

This limitation is already present in the ST10F269Zx.