st7pmc2s6 STMicroelectronics, st7pmc2s6 Datasheet - Page 48

• Manufacturer Part Number: st7pmc2s6
• Description: 8-bit Mcu For Automotive With Nested Interrupts, Flash, 10-bit Adc, Brushless Motor Control, 5 Timers, Spi, Linsci?
• Manufacturer: STMicroelectronics

Supply, reset and clock management
6.5
Note:
6.5.1
Note:
48/371
1
2
3
System integrity management (SI)
The system integrity management block contains the low voltage detector (LVD), auxiliary
voltage detector (AVD) and clock security system (CSS) functions. It is managed by the
SICSR register.
A reset can also be triggered following the detection of an illegal opcode or prebyte code.
Refer to
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
Provided the minimum V
MCU can only be in two modes:
In these conditions, secure operation is always ensured for the application without the need
for external reset hardware.
During a low voltage detector reset, the RESET pin is held low, thus permitting the MCU to
reset other devices.
The LVD allows the device to be used without any external reset circuitry.
The LVD is an optional function which can be selected by option byte.
It is recommended to make sure that the V
device is exiting from reset, to ensure the application functions properly.
Figure 13. Low voltage detector vs reset
Reset
V
V
under full software control
in static safe reset
V
V
IT-
IT+
IT-
IT+
IT-
Section 11.2.2 on page 309
reference value for a voltage drop is lower than the V
when V
when V
V
DD
DD
DD
is falling
IT-
is rising
reference value. This means that it secures the power-up as well as
DD
value (guaranteed for the oscillator frequency) is above V
Figure
ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto,
for further details.
13.
DD
supply voltage rises monotonously when the
V
hys
DD
is below:
IT+
reference value for power-
DD
supply
IT-
, the