29 January 2025
16:12
When we say that the ARM7TDMI microcontroller has 32 memory address lines, it means:
1. Addressable Memory Range:
○ Each address line can represent either 0 or 1 (binary values).
○ With 32 address lines, the total number of unique memory locations is 2322^{32}232.
○ This results in 4,294,967,296 (4 GB) addressable memory locations.
2. Addressing:
○ Each address typically points to 1 byte of data in memory (for byte-addressable systems).
○ Therefore, the theoretical maximum memory space accessible by the ARM7TDMI is 4 GB (4
GigaBytes).
3. Practical Usage:
○ Even though the architecture can address 4 GB of memory, many implementations may use
much less depending on the system design, hardware constraints, or embedded application
requirements.
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