Both chips are actually identical
silicon. All that is different is the package and the maximum rated
clock speed. The aJ-80 brings out fewer pins. For example, the data
bus is 8 bits wide compared to the aJ-100 32-bit data bus. Because
the cores are the same, the aJ-100 detailed reference manual is also
the aJ-80 technical reference. All internal registers and functions
are identical.
For example, there are five GPIO ports on both. The same port pins are just not brought out to the outside world. The
aJ80 has GPIO A-E just as the aJ100 does. You can write to the same GPIO bits on both. On the aJ80 some of those bits will only change state on the
die inside the package, not a device pin. |
