參數(shù)資料
型號(hào)： ST7FLITE09Y0M1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封裝： 0.150 INCH, PLASTIC, SOP-16
文件頁數(shù)： 30/111頁
文件大小： 671K
代理商： ST7FLITE09Y0M1
ST7FLITE0
25/111
7.5 SYSTEM INTEGRITY MANAGEMENT (SI)
The System Integrity Management block contains
the Low voltage Detector (LVD) and Auxiliary Volt-
age Detector (AVD) functions. It is managed by
the SICSR register.
7.5.1 Low Voltage Detector (LVD)
The Low Voltage Detector function (LVD) gener-
ates a static reset when the VDD supply voltage is
below a VIT-(LVD) reference value. This means that
it secures the power-up as well as the power-down
keeping the ST7 in reset.
The VIT-(LVD) reference value for a voltage drop is
lower than the VIT+(LVD) reference value for power-
on in order to avoid a parasitic reset when the
MCU starts running and sinks current on the sup-
ply (hysteresis).
The LVD Reset circuitry generates a reset when
VDD is below:
–VIT+(LVD)when VDD is rising
–VIT-(LVD) when VDD is falling
The LVD function is illustrated in Figure 16.
The voltage threshold can be configured by option
byte to be low, medium or high. See section 15.1
on page 105.
Provided the minimum VDD value (guaranteed for
the oscillator frequency) is above VIT-(LVD),the
MCU can only be in two modes:
– under full software control
– in static safe reset
In these conditions, secure operation is always en-
sured for the application without the need for ex-
ternal reset hardware.
During a Low Voltage Detector Reset, the RESET
pin is held low, thus permitting the MCU to reset
other devices.
Notes:
The LVD is an optional function which can be se-
lected by option byte. See section 15.1 on page
105.
It allows the device to be used without any external
RESET circuitry.
If the LVD is disabled, an external circuitry must be
used to ensure a proper power-on reset.
Caution: If an LVD reset occurs after a watchdog
reset has occurred, the LVD will take priority and
will clear the watchdog flag.
Figure 16. Low Voltage Detector vs Reset
VDD
VIT+(LVD)
RESET
VIT-(LVD)
Vhys
1
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ST7FLITE09Y0M6TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, timers, SPI
ST7FLITE09Y0U6 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, timers, SPI
ST7FLITE09Y0U6TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, timers, SPI
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