ST10F273Z4 STMicroelectronics, ST10F273Z4 Datasheet - Page 108
ST10F273Z4
Manufacturer Part Number
ST10F273Z4
Description
16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
Manufacturer
STMicroelectronics
Datasheet
1.ST10F273Z4.pdf
(188 pages)
Specifications of ST10F273Z4
Single Voltage Supply
5 V ±10%
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Power reduction modes
21.3.2
21.3.3
108/188
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
It is recommended to held the device under RESET (RSTIN pin forced low) until external
V
device is maintained under reset by the internal low voltage detector circuit (implemented
inside the main voltage regulator) till the internal V
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
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 V
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
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
oscillator is stopped.
DD
voltage pin is stable. Even though, at the very beginning of the power-on phase, the
Warning:
18SB
18
.
internal reference (derived from V
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.
STBY
18
becomes higher than about 1.0V, there
pin external voltage).
DD
, once this is switched off, the
DD
), the Real-Time Clock
ST10F273Z4
DD
is
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