AN1335 - APPLICATION NOTE

5/10

4 - ST10F280 REGISTERS PARTLY SUPPORTED BY THE EMULATOR

This paragraph describes all the issues caused by ST10F280 registers that are implemented in the

emulator but in a different way than the ST10F280 (new bits added or modified bit functionality).

4.1 - PICON Register

Description

Bit4 (P4LIN) is not implemented on the ST10 bond-out.

Software Impact

Application software only shall write to this register.

Hardware Impact

Hystereris cannot be implemented on P4 during emulation.

ST10F280 Emulation Impact

As usual, hysterersis is used to minimise noise effects, the impact on the application is minimized.

4.2 - WDTCON Register

Description

This register is implemented in the ST10 bond-out chip but all the bits that allow to identify the reset cause

are not implemented.

Software Impact

The cause of the reset cannot by dynamically emulated.

ST10F280 Emulation Impact

To allow to similate a reset cause, it is proposed :

the reset procedure shall be written in a way to detect which silicon is running the software : ST10F280 or

the Bond-out (via IDCHIP register). Then, when running code from the bond-out, it is proposed to use a

non initialised variable (initialised by the user before running emulation) to check the reset cause.

5 - ST10F280 PERIPHERALS NOT SUPPORTED BY THE EMULATORS

This paragraph describes all issues caused by peripherals that are not supported by the ST10 emulators.

5.1 - ST10F280 Flash

Description

In emulation, the bond-out is running code from RAM mapped into the ST10 bond-out memory space.

ST10F280 Emulation Impacts

– The automatic remapping of the flash in normal mode or bootstrap mode will not be supported => to

have one software for each memory mapping.

– Some of the Flash specific features are not supported (Flash programming commands are not recog-

nised, reading any Flash registers will lead to undefined content).

5.2 - Boostrap

Description

ST10F280 bootstrap mode cannot be supported as it is by the emulator. ST10F280 automatically

activates the boot-Flash and remaps some memory blocks if boot-strap mode is selected. ST10

bond-outs cannot do that. This limitation is not specific to ST10F280.

ST10F280 Emulation Impacts

To debug the bootstrap software routines, users will need to have a specific software for this mode. This

specific software, loaded into the emulator memory, shall have all the software inside the boot-Flash and

all the needed software from the other blocks of the Flash.