Saturday, February 27, 2016

8051 Bit Memory

8051 Bit Variables

8051 Bit Memory

  • 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.

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

List of topics: 8051

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