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Unlock Renesas Microcontroller R5F21237DFP Flash Memory needs to break Renesas IC R5F2L388 system fuse bit and then extract MCU protective firmware from flash memory.

The subsequent instruction must be executed while an interrupt request is disabled with the IENj bit in IERn of the ICU (interrupt request enable bit) set to 0 in order to clone renesas mcu r5f21192 flash memory content.

A WAIT instruction is executed immediately after the preprocessing for causing a transition to the low power consumption state.

In the above cases, after writing to an I/O register, wait until the write operation is completed using the following procedure and then execute the subsequent instruction.

• Write to an I/O register.
• Read the value in the I/O register and write it to a general register.
• Execute the operation using the value read.
• Execute the subsequent instruction.

Example of instructions

• Byte-size I/O registers

MOV.L #SFR_ADDR, R1 MOV.B #SFR_DATA, [R1] CMP    [R1].UB, R1

;; Next process

• Word-size I/O registers

MOV.L #SFR_ADDR, R1 MOV.W #SFR_DATA, [R1] CMP    [R1].W, R1

;; Next process

• Longword-size I/O registers

MOV.L #SFR_ADDR, R1 MOV.L #SFR_DATA, [R1] CMP [R1].L, R1

;; Next process

When executing an instruction after writing to multiple registers, only read the last I/O register written to and execute the instruction using that value; it is not necessary to execute the instruction using the values written to all the registers.