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The bit addressable memory in 8051 is compose from 210 bits:

- bit address space: 20H - 2FH bytes RAM = 00H - 7FH bits address;

- SFR registers;

The following addresses are NOT bit addressable, only 1-byte addressable:

- 32 bytes RAM from 00H to 1FH (R0 - R7 registers in all four banks);

- 80 bytes RAM general user from 30H to 7FH.

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Q: What is bit addressable memory in microcontroller 8051?
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