The 8051 architecture supports several physically separate memory
areas or memory spaces for program and data. Each memory area offers
certain advantages and disadvantages. There are memory spaces that
may be:
read from but not written to.
read from or written to.
read from or written to more quickly than other memory
spaces.
The wide variety of memory space available on the 8051 is quite
different from most mainframe, minicomputer, and microcomputer
architectures where the program, data, and constants are all loaded
into the same physical memory space within the computer. Refer to the
Intel 8-Bit Embedded Controllers data
book or other 8051 data books for more information about the 8051
memory architecture.
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