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參數(shù)資料
| 型號： | ST72124J2B7 |
| 廠商： | 意法半導體 |
| 英文描述： | 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| 中文描述： | 8位單電壓閃存，ADC和16位定時器，SPI和脊髓損傷界面微控制器 |
| 文件頁數(shù)： | 25/125頁 |
| 文件大?。?/td> | 776K |
| 代理商： | ST72124J2B7 |
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ST72334J/N, ST72314J/N, ST72124J
25/125
4.1 LOW VOLTAGE DETECTOR (LVD)
To allow the integration of power management
features in theapplication, the Low Voltage Detec-
tor function (LVD) generates a static reset when
the V
DD
supply voltage is below a V
LVDf
reference
value. This means that it secures the power-up as
well as the power-down keeping the ST7 in reset.
The V
LVDf
reference value for a voltage drop is
lower than the V
LVDr
reference value for power-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
DD
is below:
– V
LVDr
when V
DD
is rising
– V
LVDf
when V
DD
is falling
The LVD function is illustrated in the Figure 13.
Provided the minimum V
DD
value (guaranteed for
the oscillator frequency) is below V
LVDf
, 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
:
1) the LVD allows the device to be used without any exter-
nal RESET circuitry.
2) three different reference levels are selectable through
the OPTION BYTE according to the application require-
ment.
LVD application note
Application software can detect a reset caused by
the LVD by reading the LVDRF bit in the CRSR
register.
This bit is set by hardware when a LVD reset is
generated and cleared by software (writing zero).
Figure 13. Low Voltage Detector vs Reset
V
DD
V
LVDr
V
LVDf
RESET
HYSTERESIS
V
LVDhyst
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| ST72124J2T6 | 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72C124J2T6 | 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ST72124J2B7/XXX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2T1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2T1/XXX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2T3 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
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