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参数资料
型号： AT90USB1287-MUR
厂商： Atmel
文件页数： 60/106页
文件大小： 0K
描述： MCU AVR 128K FLASH 16MHZ 64QFN
产品培训模块： MCU Product Line Introduction
megaAVR Introduction
标准包装： 1,000
系列： AVR® 90USB
核心处理器： AVR
芯体尺寸： 8-位
速度： 16MHz
连通性： EBI/EMI，I²C，SPI，UART/USART，USB，USB OTG
外围设备： 欠压检测/复位，POR，PWM，WDT
输入/输出数： 48
程序存储器容量： 128KB（128K x 8）
程序存储器类型： 闪存
EEPROM 大小： 4K x 8
RAM 容量： 8K x 8
电压 - 电源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
数据转换器： A/D 8x10b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 64-VFQFN 裸露焊盘
包装： 带卷 (TR)
57
7593L–AVR–09/12
AT90USB64/128
9.
System control and reset
9.1
Resetting the AVR
During reset, all I/O Registers are set to their initial values, and the program starts execution
from the Reset Vector. The instruction placed at the Reset Vector must be a JMP – Absolute
Jump – instruction to the reset handling routine. If the program never enables an interrupt
source, the Interrupt Vectors are not used, and regular program code can be placed at these
locations. This is also the case if the Reset Vector is in the Application section while the Interrupt
Vectors are in the Boot section or vice versa. The circuit diagram in Figure 9-1 on page 58
shows the reset logic. Table 9-1 on page 58 defines the electrical parameters of the reset
circuitry.
The I/O ports of the AVR are immediately reset to their initial state when a reset source goes
active. This does not require any clock source to be running.
After all reset sources have gone inactive, a delay counter is invoked, stretching the internal
reset. This allows the power to reach a stable level before normal operation starts. The time-out
period of the delay counter is defined by the user through the SUT and CKSEL Fuses. The dif-
ferent selections for the delay period are presented in “Clock sources” on page 41.
9.2
Reset sources
The Atmel AT90USB64/128 has five sources of reset:
Power-on Reset. The MCU is reset when the supply voltage is below the Power-on Reset
threshold (V
POT)
External Reset. The MCU is reset when a low level is present on the RESET pin for longer
than the minimum pulse length
Watchdog Reset. The MCU is reset when the Watchdog Timer period expires and the
Watchdog is enabled
Brown-out Reset. The MCU is reset when the supply voltage V
CC is below the Brown-out
Reset threshold (V
BOT) and the Brown-out Detector is enabled
JTAG AVR Reset. The MCU is reset as long as there is a logic one in the Reset Register, one
of the scan chains of the JTAG system. Refer to Section “IEEE 1149.1 (JTAG) boundary-
scan” on page 333 for details
相关PDF资料
PDF描述
AT90USB1287-AUR MCU AVR 128K FLASH 16MHZ 64TQFP
VE-BTF-IX CONVERTER MOD DC/DC 72V 75W
VI-B3X-IX-F2 CONVERTER MOD DC/DC 5.2V 75W
VE-BTF-IW CONVERTER MOD DC/DC 72V 100W
VI-B3X-IW-F4 CONVERTER MOD DC/DC 5.2V 100W
相关代理商/技术参数
参数描述
AT90USB128X 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:USB DFU Bootloader
AT90USB162 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 8/16K Bytes of ISP Flash and USB Controller
AT90USB162-16AU 功能描述:8位微控制器 -MCU AVR USB 16K FLASH 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
AT90USB162-16AUR 功能描述:8位微控制器 -MCU 16K Flash 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
AT90USB162-16MU 功能描述:8位微控制器 -MCU AVR USB 16K FLASH 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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