STMicroelectronics ST10F272M-4T3 Locked MCU Flash Content Recovery is a process to crack ST10F272M-4T3 secured microcontroller protective fuse bit and copy the embedded software to new microprocessor ST10F272M-4T3;
CLKOUT function can output either the CPU clock (like in ST10F272M-4T3) or a software programmable prescaled value of the CPU clock. On-chip RAM memory and FLASH size have been increased. PLL multiplication factors have been adapted to new frequency range. A/D Converter is not fully compatible versus ST10F272M-4T3 (timing and programming model). Formula for the conversion time is still valid, while the sampling phase programming model is different.
Besides, additional 8 channels are available on P1L pins as alternate function: The accuracy reachable with these extra channels is reduced with respect to the standard Port5 channels. External Memory bus is affected by limitations on maximum speed and maximum capacitance load: ST10F272m is not able to address an external memory at 64 MHz with 0 wait states in the process of cloning flash memory of locked mcu st10f272m.
XPERCON register bit mapping modified according to new peripherals implementation (not fully compatible with ST10F272m). Bondout chip for emulation (ST10R201) cannot achieve more than 50MHz at room temperature (so no real time emulation possible at maximum speed).
Input section characteristics are different. The threshold programmability is extended to all port pins (additional XPICON register); it is possible to select standard TTL (with up to 400mV of hysteresis) and standard CMOS (with up to 750mV of hysteresis).