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Crack R5F10Y47ASP#30 MCU Flash Memory can help us extract MCU content from its flash after disable the security fuse, the way to disable the security fuse is by using focus ion beam technique after decapsulate the Microcontroller;

In order to do that we have to understand the structure of MCU:

Ultra-Low Power Technology
• 2.0 to 5.5 V operation from a single supply
• Stop (RAM retained): 0.56 µA
• Operating: 46 µA /MHz

RL78-S1 Core
• Instruction execution: 78 % of instructions can be
executed in 1 to 2 clock cycles
• CISC architecture (Harvard) with 3-stage pipeline
• Multiply: 8 x 8 to 16-bit result in 2 clock cycles
• 16-bit barrel shifter for shift & rotate in 2 clock cycle
• 1-wire on-chip debug function

Main Flash Memory
• Density: 1 to 4 Kbyte
• Flash memory rewritable voltage: 4.5 to 5.5 V

RAM

128 to 512 Byte size options

Supports operands or instructions

Back-up retention in all modes which is critical for reverse MCU R5F21388CNFP program

1. Total current flowing into VDD, including the input leakage current flowing when the level of the input pin is fixed to VDD or VSS. The values below the MAX. column include the peripheral operation current. However, not including the current flowing into the watchdog timer, A/D converter, I/O port, and on-chip pull-up/pull- down resistors.

2. During HALT instruction execution by flash memory.
3. When the high-speed on-chip oscillator is stopped.
4. Current flowing only to the watchdog timer (including the operating current of the low-speed on-chip oscillator). The current value of the RL78 microcontrollers is the sum of IDD1, IDD2 or IDD3 and IWDT when the watchdog timer operates for R5F21276 Microcontroller program cloning.
5. Current flowing only to the A/D converter. The current value of the RL78 microcontrollers is the sum of IDD1 or IDD2 and IADC when the A/D converter operates in an operation mode or the HALT mode.

f_IL: Low-speed on-chip oscillator clock frequency

f_IH: High-speed on-chip oscillator clock frequency

Temperature condition of the TYP. value is T_A = 25°C