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Are ARM Cortex M0 peripherals standard across manufacturers?

jc2048

The BLE chip on the micro:bit seems to be an ARM Cortex M0 but the datasheet looks very sketchy on the peripheral detail.

 

I don't know anything about ARM chips. Are the internal peripherals (timers, I2C, UARTs and so on) standard and defined by ARM or are they added by the particular chip manufacturer who has licenced the core design? If they're standard, what's my best route to learning about them?

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  • They are NOT standard - the NVIC controller and the system timer (only good for making a regular interrupt) are ARM standard but the other stuff is all manufacturer specific.

     

    I think it's the Nordic processor that is connected to the IO pins (can't be sure without making more effort since there is no easy to find MicroBit schematic on the web - perhaps someone knows where there is one.).

     

    There is quite a bit of information on the Nordic website but its certainly at nothing like the level of detail that Atmel, Microchip, ST or TI (to name a few) offer. Shame on you Nordic - I hope you are listening !!

     

    Did you find the 1.5Mbyte "Reference Manual" ?

    You will need to work quite hard at getting these peripherals to do useful stuff.

     

    MK

  • in reply to michaelkellett

    Thanks. Suspected that would be the answer.

     

    It is the Nordic BLE chip that drives the IO pins. I've only looked at the device datasheet so far and it mysteriously refers to routing the peripherals to any IO pin without saying how to do it. I wanted to see if it could do PWM that could then be routed to the micro:bit edge connector.

     

    I'll dig around and see what else I can find on their site. I should be able to find a whole reference manual if I try.

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  • in reply to michaelkellett

    Thanks. Suspected that would be the answer.

     

    It is the Nordic BLE chip that drives the IO pins. I've only looked at the device datasheet so far and it mysteriously refers to routing the peripherals to any IO pin without saying how to do it. I wanted to see if it could do PWM that could then be routed to the micro:bit edge connector.

     

    I'll dig around and see what else I can find on their site. I should be able to find a whole reference manual if I try.

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