Break protect of chip STM32F091CB

These MCUs are fabricated using a high-performance silicon gate CMOS process, embedding the R8C/Tiny Series CPU core, and are packaged in a 32-pin molded-plastic LQFP. It implements sophisticated instructions for a high level of instruction efficiency. With 1 Mbyte of address space, they are capable of executing instructions at high speed. Furthermore, the R8C/27 Group has on chip data flash. Part of models for your reference: STM32F071RB STM32F051T8 STM32F071V8 STM32F051K6 STM32F051R6 STM32F070C6 STM32F051C4 STM32F101CB STM32F103C8 STM32F103VD STM32F101VG STM32F101ZG STM32F102R8 STM32F107RC STM32F103VC STM32F103VB STM32F103ZF STM32F105VC STM32F105RC TM32F103T6 STM32F103RE STM32F105RB STM32F103ZG STM32F103T4 STM32F103C4 STM32F103RB STM32F102R4 STM32F102C4 STM32F102R4 STM32F102C8 STM32F105VB STM32F103VG STM32F051 STM32F070 STM32F048 STM32F100R6 STM32F100R8 STM32F100RB