How to make AOB Script that access only one address for Emulator

[Firstlast2s100]

I am trying to hack "Classic Super Mario Bros." through "mGBA Emulator". The TImer Value in it is 4-Byte Big Endian.
When I right-clicked on it and clicked "Find out what writes to this address", I got only one opcode which is "mov [rax+rbx],r8b".
Then I want to its disassembler and right clicked on it and clicked "Find out what addresses this instruction access", I got at least 500 or more addresses which were access accessing it.
So now if I create a default AOB script using template and enable it then the game and its graphics glitch and do not get corrected until I restart the emulator.
So anyone tell me how to create AOB script. If I do it using "Pointer Scan" then it will take me a lot of time.
I am also attached below screenshot's for better understanding.
Thankyou.
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[Firstlast2s100]

I also try Pointer scan of an time address, but its show zero result.