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Decapsulate MCU ST62T30 Flash Memory is by using the chemical solution such nitric acid to dissolve the plastic package off the MCU and get access to the internal wafer die:

The Low Frequency Auxiliary Oscillator has three main purposes. Firstly, it can be used to reduce power consumption in non timing critical routines. Secondly, it offers a fully integrated system clock, without any external components. Lastly, it acts as a backup oscillator in case of main oscillator failure.

This oscillator is available when the OSG ENABLED option is selected in the option byte (refer to the Option Bytes section of this document). In this case, it automatically starts one of its periods after the first missing edge of the main oscillator, whatever the reason for the failure (main oscillator de- fective, no clock circuitry provided, main oscillator switched off…). See below Figure.

LFAO Oscillator function

User code, normal interrupts, WAIT and STOP instructions, are processed as normal, at the reduced fLFAO frequency. The A/D converter accuracy is decreased, since the internal frequency is below 1.2 MHz.
At power on, until the main oscillator starts, the reset delay counter is driven by the LFAO. If the main oscillator starts before the 2048 or 32768 cycle delay has elapsed, it takes over.

Decapsulate MCU ST62T30 Flash Memory

The Low Frequency Auxiliary Oscillator is automatically switched off as soon as the main oscillator starts.

ADC CONTROL REGISTER (ADCR)
Address: 0D1h — Read/Write Reset value: 0100 0000 (40h)

ADCR 7 ADCR 6 ADCR 5 ADCR 4 ADCR 3 OSC OFF ADCR 1 ADCR 0

Bit 7:3, 1:0 = ADCR[7:3], ADCR[1:0] ADC Control Register.
These bits are used to control the A/D converter (if available on the device) otherwise they are not used.

Bit 2 = OSCOFF Main Oscillator Off.
0: Main oscillator enabled 1: Main oscillator disabled
Note: The OSG must be enabled using the OSGEN option in the Option Byte, otherwise the OSCOFF setting has no effect.