ARM Cortex-M3 Manual do Utilizador descarregar pdf (Página 19)

19

Word alias

Physical bit

32MB

Bit band alias

32MB

31MB

1MB

Bit band region

Bit band alias

32MB

31MB

1MB

Bit band region



Writes to a word address in the

bit band alias affect a single bit in

the bit band region



The write is translated to an atomic

read

-

modify

-

write by the Cortex

-

M3

bus matrix



Bit 0 of the stored register is written

to the appropriate bit

Cortex

-

M3 Bit Banding

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 40 41

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