8051 Bit Memory

8051 Bit Variables

• 0x20 – 0x2F: Bit Memory
• It occupies 16 bytes of internal RAM from 0x20 through 0x2F.
• 128 bit variables, numbered 00h through 7fh.
• These variables may be either 1 or 0.
• User can set or clear any of the bit variables.
• 8051 provides special instructions to access these 16 bytes of memory on a bit by bit basics.
• SETB and CLR commands are used to set and clear bit variables.
• It is also byte addressable.
• Bit variables 00h to 7Fh are for user defined functions in their programs.
• Bit variables 80h and above are actually used to access certain SFR’s on a bit by bit basics.

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Related topics:
8051 Program Memory   |   8051 Data Memory   |   8051 Register Bank   |   8051 Special Function Registers   |   8051 Memory Map

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List of topics: 8051

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