ST72344S4 STMicroelectronics, ST72344S4 Datasheet - Page 49

• Manufacturer Part Number: ST72344S4
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST72344S4

• Up To 16 Kbytes Program Memory: single voltage extended Flash (XFlash) with readout and write protection, in-circuit and inapplication programming (ICP and IAP). 10K write/erase cycles guaranteed, data retention
• 256 Bytes Data Eeprom With Readout Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: crystal/ceramic resonator oscillators, high-accuracy internal RC oscillator or external clock
• 5 Power-saving Modes: Slow, Wait, Halt, Auto-wakeup from Halt and Active-halt
• 16-bit Timer A With: 1 input capture, 1 output compares, external clock input, PWM and pulse generator modes
• 16-bit Timer B With: 2 input captures, 2 output compares, PWM and pulse generator modes

ST72344xx ST72345xx
7.6.1
Note:
7.6.2
Note:
Low-voltage detector (LVD)
The low-voltage detector function (LVD) generates a static reset when the V
voltage is below a V
the power-down keeping the ST7 in reset.
The V
on in order to avoid a parasitic reset when the MCU starts running and sinks current on the
supply (hysteresis).
The LVD Reset circuitry generates a reset when V
●
●
The LVD function is illustrated in
The LVD is an optional function which can be selected by option byte.
LVD threshold configuration: the voltage threshold can be configured by option byte to be
low, medium or high. The configuration should be chosen depending on the f
parameters in the application. When correctly configured, the LVD ensures safe power-on
and power-off conditions for the microcontroller without using any external components.
To determine which LVD thresholds to use:
●
●
●
During a low-voltage detector reset, the RESET pin is held low, thus permitting the MCU to
reset other devices.
Figure 18. Low voltage detector vs. reset
Auxiliary-voltage detector (AVD)
The AVD is used to provide the application with an early warning of a drop in voltage. If
enabled, an interrupt can be generated allowing software to shut down safely before the LVD
resets the microcontroller. See
The AVD function is active only if the LVD is enabled through the option byte (see
Option bytes on page
the selected LVD threshold.
RESET
V
V
IT+(LVD)
IT-((LVD)
V
V
Define the minimum operating voltage for the application V
Refer to the Electrical Characteristics section to get the minimum operating voltage for
the MCU at the application frequency V
Select the LVD threshold that ensures that the internal reset is released at V
and activated at V
IT-
IT+
IT-
reference value for a voltage drop is lower than the V
when V
when V
V
DD
DD
DD
is falling
IT-
is rising
232). The activation level of the AVD is fixed at around 0.5 mV above
reference value. This means that it secures the power-up as well as
DD(MCUmin)
Doc ID 12321 Rev 5
Figure
Figure
19.
18.
DD(min)
V
hys
DD
.
Supply, reset and clock management
is below:
IT+
APP(min)
reference value for power-
DD
OSC
supply
APP(min)
and V
15.1:
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DD