33.8 CPU AHB Bus
The CPU AHB bus (AHBP) is an interface that connects the CPU directly to the PORT. It supports 8-bit, 16-bit and 32-bit sizes.
This bus is generally used for low latency operation. The Data Direction (DIR) and Data Output Value (OUT) registers can be read, written, set, cleared, or be toggled using this bus, and the Data Input Value (IN) registers can be read.