1. Overall frame structure
Access to external memory obviously requires a 16-bit address bus, but the use of external memory is very flexible: it can store program code or data.
2. Bus structure
Since the storage of Program Code and Data is separate, although the same bus is used, the Program Code is stored in ROM; based on this, the bus structure of 8051 should be understood as a Harvard structure.
3. Memory structure
(1) ROM
(2) RAM
00~7F: DATA area
-- 00~1F, Bank Register, 4 Banks, 32 Bytes;
-- 20~2F, bit addressing;
-- 30~7F, general data area;
80~FF:SFR
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