ARM Cortex-M3 Manuel d'utilisateur télécharger pdf (Page 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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