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PXAG39 MCU Source Code Replication means the content from eeprom and flash can be read out and transfer to other blank PXAG39, in order to do that we need to have a default loader; A default loader that accepts programming commands in a predetermined format is contained permanently in the Boot ROM. A factory fresh device will enter this loader automatically if it is powered up without first being programmed by the user.

PXAG39 MCU Source Code Replication

Loader commands include functions such as erase block; program Flash memory; read Flash memory; and blank check. The XA-G49 contains two special FLASH registers: the BOOT VECTOR and the STATUS BYTE. The “Boot Vector” allows forcing the execution of a user supplied Flash loader upon reset, under two specific sets of conditions.

At the falling edge of reset, the XA-G49 examines the contents of the Status Byte. If the Status Byte is set to zero, power-up execution starts at location 0000H, which is the normal start address of the user’s application code obtained from Microcontroller extraction.

When the Status Byte is set to a value other than zero, the Boot Vector is used as the reset vector (4 bytes), including the Boot Program Counter (BPC) and the Boot PSW (BPSW). The factory default settings are 8000h for the BPSW and F800h for the BPC, which corresponds to the address F900h for the factory masked-ROM ISP boot loader. The Status Byte is automatically set to a non-zero value when a programming error occurs when Crack HA2089 Microprocessor Flash Memory.

A custom boot loader can be written with the Boot Vector set to the custom boot loader. NOTE: When erasing the Status Byte or Boot Vector, these bytes are erased at the same time. It is necessary to reprogram the Boot Vector after erasing and updating the Status Byte.