How does bit banding mitigate the Read-Modify-Write reentrant issue for the TM4C123GH6PM.

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engineering Electrical-Engineering

Answer 1

Answer #1

Answer :- In ARM Cortex M3 and M4, bit banding has been used. The points related to bit banding are-

1MB bit band region in peripheral memory area and one in SRAM, have been mapped to 32MB virtual 'alias' region.
The LSB of each 32-bit word in alias region is used to change the bit of bit band region.
So, to change a bit of peripheral register, we don't need to modify the value of peripheral register, we don't need to perform read-modify-write on the complete register.
Writing to the LSB of alias 32-bit register will change the corresponding bit in the peripheral register, which is mapped to this register.
Reading LSB of 32-bit alias register, will give mapped bit value of peripheral register.

Answer 2

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