描述
3hac034526-001
?一般情況下，當確定了存儲程序代碼和數(shù)據(jù)所需要的存儲空間之后，設計工程師將決定是采用內部存儲器還是外部存儲器。通常情況下，內部存儲器的性價比最高但靈活性最低，因此設計工程師必須確定對存儲的需求將來是否會增，以及是否有某種途徑可以升級到代碼空間更大的微控制器。基于成本考慮，們通常選擇能滿足應用要求的存儲器容量最小的微控制器，因此在預測代碼規(guī)模的時候要必須特別小心，因為代碼規(guī)模增大可能要求更換微控制器。目前市場上存在各種規(guī)模的外部存儲器器件，我們很容易通過增加存儲器來適應代碼規(guī)模的增加。有時意味著以封裝尺寸相同但容量更大的存儲器替代現(xiàn)有的存儲器，或者在總線上增加存儲器。即使微控制器帶有內部存儲器，也可以通過增加外部串行EEPROM或閃存來滿足系統(tǒng)對非易失性存儲器的需求。在較大的微控制器系統(tǒng)或基于處理器的系統(tǒng)中，設計工程師可以利用引導代碼進行初始化。應用本身通常決定了是否需要引導代碼，以及是否需要專門的引導存儲器。例如，如果沒有外部的尋址總線或串行引導接口，通常使用內部存儲器，而不需要專門的引導器件。但在一些沒有內部程序存儲器的系統(tǒng)中，初始化是操作代碼的一部分，因此所有代碼都將駐留在同一個外部程序存儲器中。某些微控制器既有內部存儲器也有外部尋址總線，在這種情況下，引導代碼將駐留在內部存儲器中，而操作代碼在外部存儲器中。這很可能是最安全的方法，因為改變操作代碼時不會出現(xiàn)意外地修改引導代碼。在所有情況下，引導存儲器都必須是非易失性存儲器。
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