Architecture for microcontroller and method for reading data applied to microcontroller

An architecture for a microcontroller includes a microcontroller, a system memory, an instruction memory, a data memory, a first bus, and a second bus, where the first and second buses perform functions of a single bus. The microcontroller connects to both buses. The instruction memory and the data memory are connected to the first bus. The system memory is connected to the second bus. The microcontroller transmits and receives data to and from the instruction memory and the data memory through the first bus. The microcontroller transmits and receives data to and from the system memory through the second bus. The instruction memory and the data memory transmit and receive data to and from the system memory through the second bus connected to the first bus, avoiding delays caused by rights and priorities and arbitration of same.