参数资料
型号: ST72F60E1M1
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, PDSO24
封装: 0.300 INCH, LEAD FREE, PLASTIC, SOP-24
文件页数: 58/139页
文件大小: 1993K
代理商: ST72F60E1M1
ST7260xx
Reset and clock management
25/139
7
Reset and clock management
7.1
Reset
The Reset procedure is used to provide an orderly software start-up or to exit low power
modes.
Three reset modes are provided: a low voltage (LVD) reset, a watchdog reset and an
external reset at the RESET pin.
A reset causes the reset vector to be fetched from addresses FFFEh and FFFFh in order to
be loaded into the PC and with program execution starting from this point.
An internal circuitry provides a 4096 CPU clock cycle delay from the time that the oscillator
becomes active.
Caution:
When the ST7 is unprogrammed or fully erased, the Flash is blank and the RESET vector is
not programmed. For this reason, it is recommended to keep the RESET pin in low state
until programming mode is entered, in order to avoid unwanted behavior
7.2
Low voltage detector (LVD)
Low voltage reset circuitry generates a reset when VDD is:
below VIT+ when VDD is rising,
below VIT- when VDD is falling.
During low voltage reset, the RESET pin is held low, thus permitting the MCU to reset other
devices.
It is recommended to make sure that the VDD supply voltage rises monotonously when the
device is exiting from Reset, to ensure the application functions properly.
7.2.1
Watchdog reset
When a watchdog reset occurs, the RESET pin is pulled low permitting the MCU to reset
other devices in the same way as the low voltage reset (Figure 9).
7.2.2
External reset
The external reset is an active low input signal applied to the RESET pin of the MCU.
As shown in Figure 12, the RESET signal must stay low for a minimum of one and a half
CPU clock cycles.
An internal Schmitt trigger at the RESET pin is provided to improve noise immunity.
相关PDF资料
PDF描述
ST72F60K2DIE1 8-BIT, MROM, 8 MHz, MICROCONTROLLER, UUC
ST72F60K2DIE6 8-BIT, MROM, 8 MHz, MICROCONTROLLER, UUC
ST72F651AR6T1 8-BIT, FLASH, MICROCONTROLLER, PQFP64
ST72P60E2M1 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
ST7260E2M1/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
相关代理商/技术参数
参数描述
ST72F60E2M1 功能描述:8位微控制器 -MCU ST7262 Lo Spd USB 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
ST72F60K1U1 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR 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
ST72F60K1U1TR 功能描述:8位微控制器 -MCU ST7262 Lo Spd USB 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
ST72F60K2B1 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR 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
ST72F60K2U1TR 功能描述:8位微控制器 -MCU ST7262 Lo Spd USB 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