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Bootloader for ARM Cortex-M0: No vector table offset register (VTOR) #ARM

Bootloader for ARM Cortex-M0: No VTOR

Kevin Cuzner writes in Projects & Libraries about the ARM Cortex-M0 microcontroller and a key architectural piece missing from the Cortex-M0 which the M0+ does not have: The vector table offset register (VTOR).

After I purchased the microcontroller for my project (an STM32F042) I discovered that it was a Cortex-M0 and did not have a VTOR. This was a rather unpleasant surprise and now I know that the M0 sucks compared to the M0+. Nonetheless, I was able to overcome this with a fairly simple software shim and that’s what I want to share.

The article explains how to overcome the lack of a VTOR to write a USB bootloader which supports a semi-safe fallback mode.

A good read for lower level programmers. See the full article here.


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