W79E804A/803A/802A
7. MEMORY ORGANIZATION
The W79E804 series separate the memory into two separate sections, the Program Memory and the
Data Memory. The Program Memory is used to store the instruction op-codes, while the Data Memory
is used to store data or for memory mapped devices.
7.1
Program Memory (on-chip Flash)
The Program Memory on the W79E804 series can be up to
8K/4K/2K
bytes long. All instructions are
fetched for execution from this memory area. The MOVC instruction can also access this memory
region.
7.2
Data Memory
The NVM Data Memory of Flash EPROM on the W79E804 series can be up to
256
bytes long. The
W79E804 series read the content of data memory by using “MOVC A, @A+DPTR”. To write data is by
NVMADDR, NVMDAT and NVMCON SFR’s registers.
Figure 7-1: W79E804 series Memory Map
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