On Sun, 1 Jul 2018 12:06:17 +0100, The Natural Philosopher
 declaimed the following:

>Welll that was what I said.
>
>"So how does ARM handle peripheral hardware?"
>
>I.e Does ARM have memory mapped IO?
>

 Something that should be easily found by perusing the documentation...
EG: a lack of dedicated I/O port instructions, say... (since the ARM
instruction set is probably the thinner document to study, and likely found
on ARM's web-site).

 The actual peripherals and memory map vary so much between
implementations (remember, ARM sells designs for cores, but peripherals are
manufacturer add-ons). TI's TIVA TMC4 series has entire "memory" banks
whose only purpose is to set/clear single bits of memory ("bit-band" -- one
bank for SRAM, one bank for "peripheral"). Instead of needing to load a
word into a register, AND or OR a bit mask, and write the word back to
memory -- one just accesses the "bit-band alias" address. A whole 32-MB of
addresses just used to access single bits in a 1-MB region of real memory.
One would need to study the implementation's documentation to determine the
actual memory/peripheral addresses available.


--
 Wulfraed                 Dennis Lee Bieber         AF6VN
 wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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