User application area (AP area): refers to the user's own programming area
ISP zone: ISP zone refers to a program that has been solidified inside the microcontroller when the chip is released. The STC microcontroller can download the program by serial ISP, this is because the ISP guide code has been fixed inside the microcontroller when the chip is released. When the program is powered on for the first time, the code will be executed from the ISP area, which is reflected in the actual experiment, when downloading a program, we need to first download the software interface, and then enable the single-chip microcomputer power. When the single-chip computer detects the need for downloading the program, enable the ISP download function to download the program to the microcontroller. If the PC has not been detected to need to download the program for a short period of time, the MCU will execute the code from the user application area (AP area.
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