According to the bus structure, it can be divided into a bus type and a non-bus type. As we often see the 89C51 microcontroller is the bus structure, 89C51 microcontroller has a data bus, address bus, and control bus (WR, RD, EA, ALE, etc.). The 20-pin 89C2051 microcontroller is a non-bus type. The external pins are small, which can reduce the cost. FIG
classification
SCM application mode of FIG. 1.2 1.3 bus bus application mode FIG bus 1.4 Non application mode bus
1.5
FIG non-application mode bus Figure 1.6 dedicated application mode
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