參數(shù)資料
型號: ST72321BM
廠商: 意法半導體
英文描述: 80-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE(具有ICP,IAP,Nested Interrupt,TLI,ROP的8位MCU)
中文描述: 80引腳8位微控制器32至60,000閃存/ ROM,ADC的,5個定時器,SPI和SCI的I2C接口(具有比較方案,國際檢察官聯(lián)合會,嵌套中斷,中華語文研習所,人事登記的8位微控制器)
文件頁數(shù): 27/178頁
文件大?。?/td> 3121K
代理商: ST72321BM
ST72F321M, ST72321BM
27/178
6.4 SYSTEM INTEGRITY MANAGEMENT (SI)
The System Integrity Management block contains
the Low Voltage Detector (LVD), and Auxiliary
Voltage Detector (AVD) functions. It is managed
by the SICSR register.
6.4.1 Low Voltage Detector (LVD)
The Low Voltage Detector function (LVD) gener-
ates a static reset when the V
DD
supply voltage is
below a V
IT-
reference value. This means that it
secures the power-up as well as the power-down
keeping the ST7 in reset.
The V
IT-
reference value for a voltage drop is lower
than the V
IT+
reference value for power-on in order
to avoid a parasitic reset when the MCU starts run-
ning and sinks current on the supply (hysteresis).
The LVD Reset circuitry generates a reset when
V
DD
is below:
– V
IT+
when V
DD
is rising
– V
IT-
when V
DD
is falling
The LVD function is illustrated in
Figure 14
.
The voltage threshold can be configured by option
byte to be low, medium or high.
Provided the minimum V
DD
value (guaranteed for
the oscillator frequency) is above V
IT-
, 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 allows the device to be used without any
external RESET circuitry.
If the medium or low thresholds are selected, the
detection may occur outside the specified operat-
ing voltage range. Below 3.8V, device operation is
not guaranteed.
The LVD is an optional function which can be se-
lected by option byte.
It is recommended to make sure that the V
DD
sup-
ply voltage rises monotonously when the device is
exiting from Reset, to ensure the application func-
tions properly.
Figure 14. Low Voltage Detector vs Reset
V
DD
V
IT+
V
IT-
RESET
V
hys
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