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参数资料
型号： ST72F324K4B5
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装： 0.400 INCH, ROHS COMPLIANT, SHRINK, PLASTIC, DIP-32
文件页数： 86/164页
文件大小： 2897K
代理商： ST72F324K4B5
ST72324Jx ST72324Kx
28/164
SYSTEM INTEGRITY MANAGEMENT (Cont’d)
6.4.2 Auxiliary Voltage Detector (AVD)
The Voltage Detector function (AVD) is based on
an analog comparison between a VIT-(AVD) and
VIT+(AVD) reference value and the VDD main sup-
ply. The VIT- reference value for falling voltage is
lower than the VIT+ reference value for rising volt-
age in order to avoid parasitic detection (hystere-
sis).
The output of the AVD comparator is directly read-
able by the application software through a real
time status bit (AVDF) in the SICSR register. This
bit is read only.
Caution: The AVD function is active only if the
LVD is enabled through the option byte (see Sec-
tion 14.1 on page 150).
6.4.2.1 Monitoring the VDD Main Supply
The AVD voltage threshold value is relative to the
selected LVD threshold configured by option byte
(see
If the AVD interrupt is enabled, an interrupt is gen-
erated when the voltage crosses the VIT+(AVD) or
VIT-(AVD) threshold (AVDF bit toggles).
In the case of a drop in voltage, the AVD interrupt
acts as an early warning, allowing software to shut
down safely before the LVD resets the microcon-
troller. See Figure 16.
The interrupt on the rising edge is used to inform
the application that the VDD warning state is over.
If the voltage rise time trv is less than 256 or 4096
CPU cycles (depending on the reset delay select-
ed by option byte), no AVD interrupt will be gener-
ated when VIT+(AVD) is reached.
If trv is greater than 256 or 4096 cycles then:
– If the AVD interrupt is enabled before the
VIT+(AVD) threshold is reached, then 2 AVD inter-
rupts will be received: the first when the AVDIE
bit is set, and the second when the threshold is
reached.
– If the AVD interrupt is enabled after the VIT+(AVD)
threshold is reached then only one AVD interrupt
will occur.
Figure 16. Using the AVD to Monitor VDD
VDD
VIT+(AVD)
VIT-(AVD)
AVDF bit
0
RESET VALUE
IF AVDIE bit = 1
Vhyst
AVD INTERRUPT
REQUEST
INTERRUPT PROCESS
VIT+(LVD)
VIT-(LVD)
LVD RESET
Early Warning Interrupt
(Power has dropped, MCU not
not yet in reset)
1
trv VOLTAGE RISE TIME
1
相关PDF资料
PDF描述
ST72F324K6B5 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
ST72F324K4T6 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
ST72F324K2T6 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
ST72F324J6T5 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44
ST72F324K4T3 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
相关代理商/技术参数
参数描述
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ST72F324K4T6TR 功能描述:8位微控制器 -MCU 5V RANGE 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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ST72F324K4TA/TR 功能描述:8位微控制器 -MCU AUTO 8BIT MICRO RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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