ISP and IAP programming of microcontroller-EEWORLD

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ISP: In-system programming. ISP generally programs the Flash memory inside the microcontroller through a serial programming interface dedicated to the microcontroller.

IAP: In-Application Programming (IAP) is a programming mode applied to Flash program memory. It can read/write another section of program Flash space by calling a specific IAP program when the application is running normally. It can even control the read/write operation of a certain section, a certain page or even a certain byte, which brings greater flexibility for data storage and field upgrades of firmware.

If the IAP program is damaged, the product must be returned to the factory to re-program, which is very troublesome and very time-consuming and costly. To meet such requirements, STM32 automatically sets the first 4 pages of the user Flash area as write protection while implementing read protection on the Flash area, which can effectively ensure that the IAP program area will not be accidentally damaged.

Difference: ISP generally programs the Flash memory inside the microcontroller through a dedicated serial programming interface for the microcontroller, while IAP technology maps the Flash memory into two storage bodies from a structural perspective. When the user program on one storage body is running, the other storage body can be reprogrammed, and then the control is transferred from one storage body to another. The implementation of ISP generally requires very little external circuit assistance, while the implementation of IAP is more flexible. It can usually use the serial port of the microcontroller to connect to the RS232 port of the computer to program the internal memory through a specially designed firmware program.

Keywords：MCU Reference address：ISP and IAP programming of microcontroller

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