关键词: Cotex-M0, 预取策略, Flash接口

Abstract: To implement the instruction reading of low power microcontroller of low power microcontroller based on Cortex-M0 bus architecture袁a kind of Pre-fetching strategy, based on M0's instruction and bus characteristics, is provided. With the arbitrary integer frequency ratio of the flash interface clock to AHB bus clock, an instruction reading interface based on specific flash timing sequence is supplied, and the real-time response of the system to the AHB bus instruction and data request issued by Cortex-M0 is implemented. In addition, the establishment of on-chip-system simulation experiment platform has verified the correctness of the design. Simulation program based on cork-mark is used in the circuit system| the results show that the instruction running efficiency can be improved to 23. 77%.

Key words: Cotex-M0, pre-fetching strategy, Flash interface