Clone Renesas Microcontroller R5F21237DFP Flash Program and copy the firmware to new Renesas MCU, the newly programmed MCU R5F21237DFR will provide the exactly same functions as master microprocessor, the protective system of Renesas microcontroller can be attacked by focus ion beam technique;
During sleep mode or mode transitions, do not write to the system control related registers (indicated by ‘SYSTEM’ in the Module Symbol column in Table 4.1, List of I/O Registers (Address Order)).
Permanent damage to the MCU may result if absolute maximum ratings are exceeded. To preclude any malfunctions due to noise interference, insert capacitors of high frequency characteristics between the VCC and VSS pins, between the AVCC0 and AVSS0 pins, between the VCC_USB and VSS_USB pins, and between the VREFH0 and VREFL0 pins.
Place capacitors of about 0.1 μF as close as possible to every power supply pin and use the shortest and heaviest possible traces. Also, connect capacitors as stabilization capacitance when disable the security fuse bit of renesas mcu r5f21226dfp in the process of unlocking its flash memory.