ST10F273Z4 Datasheet, PDF (108/188 Pages) STMicroelectronics – 16-bit MCU with 512 Kbyte Flash memory and 36 Kbyte RAM

Power reduction modes
ST10F273Z4
Warning:
During power-off phase, it is important that the external
hardware maintains a stable ground level on RSTIN pin,
without any glitch, in order to avoid spurious exiting from
reset status with unstable power supply.
21.3.2
21.3.3
Exiting stand-by mode
After the system has entered the Stand-by mode, the procedure to exit this mode consists of
a standard Power-on sequence, with the only difference that the RAM is already powered
through V_18SB internal reference (derived from V_STBY pin external voltage).
It is recommended to held the device under RESET (RSTIN pin forced low) until external
V_DD voltage pin is stable. Even though, at the very beginning of the power-on phase, the
device is maintained under reset by the internal low voltage detector circuit (implemented
inside the main voltage regulator) till the internal V₁₈ becomes higher than about 1.0V, there
is no warranty that the device stays under reset status if RSTIN is at high level during
power ramp up. So, it is important the external hardware is able to guarantee a stable
ground level on RSTIN along the power-on phase, without any temporary glitch.
The external hardware shall be responsible to drive low the RSTIN pin until the V_DD is
stable, even though the internal LVD is active.
Once the internal Reset signal goes low, the RAM (still frozen) power supply is switched to
the main V₁₈.
At this time, everything becomes stable, and the execution of the initialization routines can
start: XRAM2EN bit can be set, enabling the RAM.
Real-time clock and stand-by mode
When Stand-by mode is entered (turning off the main supply V_DD), the Real-Time Clock
counting can be maintained running in case the on-chip 32 kHz oscillator is used to provide
the reference to the counter. This is not possible if the main oscillator is used as reference
for the counter: Being the main oscillator powered by V_DD, once this is switched off, the
oscillator is stopped.
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