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Cx51 User's Guide
bdata
The bdata memory type may be used to declare variables only. You may not declare bdata functions. This memory is directly accessed using 8-bit addresses and is the on-chip bit-addressable RAM of the 8051. Variables declared with the bdata type are bit-addressable and may be read and written using bit instructions.
Variables declared bdata are located in the BDATA memory class.
Declare bdata variables as follows:
unsigned char bdata bdata_var;
Refer to Bit-Addressable Objects for more information about the bdata type.
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