GBA Architecture

The Game Boy Advance is a handheld console that was released by Nintendo in 2001. It has a 32-bit ARM7TDMI CPU running at 16.78 MHz, a custom GPU that can render 2D graphics with scaling and rotation, and 32 KB of internal RAM and 96 KB of VRAM. It can also play Game Boy and Game Boy Color games using a built-in Sharp SM83 chip running at 4.2 or 8.4 mhz.

ARM7TDMI documentation: https://www.gregorygaines.com/blog/decoding-the-arm7tdmi-instruction-set-game-boy-advance/