The idata memory type may be used to declare variables
only. You may not declare idata functions. This memory is
indirectly accessed using 8-bit addresses and is the on-chip RAM of
the 8051. The amount of idata is limited in size (to 256 bytes
or less). The lower addresses of idata overlap the
corresponding addresses of data memory.
Variables declared idata are located in the IDATA
memory class.
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