LE: As Harvard architecture is the foundation of the 8051. The program and data memory are connected externally separately. 16 lines are used to access this external memory, of which 8 lines are used as data lines in addition to serving as lower order 8 lines of a 16-bit external address. We utilize an 8-bit external latch to make these 8 lines function first as address lines and then as 8 lines for data. The control signal for latching the low byte of the address during access to external memory is provided by the Address Latch Enable output pulse.
Which of the microcontroller's pins are most useful, along with their functions?
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LE: As Harvard architecture is the foundation of the 8051. The program and data memory are connected externally separately. 16 lines are used to access this external memory, of which 8 lines are used as data lines in addition to serving as lower order 8 lines of a 16-bit external address. We utilize an 8-bit external latch to make these 8 lines function first as address lines and then as 8 lines for data. The control signal for latching the low byte of the address during access to external memory is provided by the Address Latch Enable output pulse.
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