Replace the outdated and confusing memory map

[iampi31415]

The section on peripherals is very neat. There you've the image:

I think the image is quite hard to grasp. The datasheet source is here.

The centre column spans to 0xFFFF_FFFF so 2^32 addresses. The left and right columns are a split view of the processor, and the centre-column is the MCU?

And, for example

• FLASH: is at the bottom left-hand-side, goes from 0x0000_0000 to 0x0008_0000 which is 8*2^16=2^9*1024 and since each of those addresses has an associated byte of memory, that's 512 KiB, which matches the manual.
• Data RAM is at the bottom right-hand-side is 64KiB.

But then things like External RAM / External Device do not come with the board (I assume), but are addresses reserved to access such devices, were they added to the board?

[iampi31415]

I think I'm close but not quite there

[BartMassey]

Yeah, that diagram isn't a good choice for this book: it should be replaced with something simpler. Also upside-up: it's not unusual to put "higher" addresses at the top in these diagrams, but it sure makes it more confusing to read. Also, that map is from the 52832 used on the MB1: the 52833 has 128K of internal data RAM.

If you want to try to draw a simplified diagram that would be great. Otherwise I'll get to it eventually.

[iampi31415]

To be fair, I like the image, I just think my knowledge isn't quite there to follow it (notice this book is more advanced than the others). But I appreciate your comment.

The image was copied from the datasheet IIUC.

Do you think you can answer my question / or correct me?

The left and right columns are a split view of the processor, and the centre-column is the MCU?
And then things like External RAM / External Device do not come with the board (I assume). So are addresses "reserved" to access such devices, were they added or connected to the board (like a USB device or an SD memory card)?

[BartMassey]

The columns in that diagram are confusing. I think the left and right columns are a split view of the Nordic-specific parts of the chip, while the center column is generic ARM Cortex-M4 stuff: that's what the column headings say, anyway.

Take a look at the memory map in section 4.2.3 of the nRF52833 manual (p. 21), which is much simpler and clearer. There again, though, the headings "System Address Map" and "Address Map" are not very helpful — I think System Address Map is generic Cortex-M, while "Address Map" is Nordic-specific. But don't quote me.

[iampi31415]

Thank you