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The A-type has a maximum oscillator frequency of 20 MHz (instead of 10 MHz).
There are some small timing differences, of which the most important seems to be: MCLR low puls width, erase/program cycle time.
see this table:
this link contains the details about the fifferences between the 16f84 and 16f84AA
Thanks a lot ,eng_ahmed22. I come to realize how different bet: 16f84 and 16f84a. But I can not apply it yet. Can the program work correctly if I burn the 16f84a with the program of 16f84? What is the Ghost location? Pls tell me.
Thanks in advance.