參數(shù)資料
型號: AT89C51RD2-RLRUM
廠商: Atmel
文件頁數(shù): 3/137頁
文件大小: 0K
描述: IC MCU FLASH 8051 EEP 64K 44VQFP
產(chǎn)品培訓模塊: MCU Product Line Introduction
標準包裝: 1,500
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: SPI,UART/USART
外圍設備: POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LQFP
包裝: 標準包裝
配用: AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
其它名稱: AT89C51RD2-RLRUMDKR
100
4235K–8051–05/08
AT89C51RD2/ED2
24.6.4
Bootloader Functionality
The bootloader can be activated by two means: Hardware conditions or regular boot process.
The Hardware conditions (EA = 1, PSEN = 0) during the Reset# falling edge force the on-chip
bootloader execution. This allows an application to be built that will normally execute the end
user’s code but can be manually forced into default ISP operation.
As PSEN is a an output port in normal operating mode after reset, user application should take
care to release PSEN after falling edge of reset signal. The hardware conditions are sampled at
reset signal falling edge, thus they can be released at any time when reset input is low.
To ensure correct microcontroller startup, the PSEN pin should not be tied to ground during
power-on (See Figure 24-4).
Figure 24-4. Hardware conditions typical sequence during power-on.
The on-chip bootloader boot process is shown Figure 24-5.
VCC
PSEN
RST
Table 24-6.
Bootloader Process Description
Purpose
Hardware Conditions
The Hardware Conditions force the bootloader execution whatever BLJB,
BSB and SBV values.
BLJB
The Boot Loader Jump Bit forces the application execution.
BLJB = 0 => Bootloader execution
BLJB = 1 => Application execution
The BLJB is a fuse bit in the Hardware Byte.
It can be modified by hardware (programmer) or by software (API).
Note: The BLJB test is performed by hardware to prevent any program
execution.
SBV
The Software Boot Vector contains the high address of customer bootloader
stored in the application.
SBV = FCh (default value) if no customer bootloader in user Flash.
Note: The customer bootloader is called by JMP [SBV]00h instruction.
相關PDF資料
PDF描述
VE-B52-IW-F3 CONVERTER MOD DC/DC 15V 100W
MS27473T24F61PA CONN PLUG 61POS STRAIGHT W/PINS
D38999/24FD18PB CONN RCPT 18POS JAM NUT W/PINS
VE-B52-IW-F2 CONVERTER MOD DC/DC 15V 100W
AT89C51CC03C-S3RIM IC 8051 MCU FLASH 64K 52PLCC
相關代理商/技術參數(shù)
參數(shù)描述
AT89C51RD2-RLTIM 功能描述:IC 8051 MCU FLASH 64K 44VQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:89C 標準包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設備:POR,WDT 輸入/輸出數(shù):32 程序存儲器容量:32KB(32K x 8) 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP(0.600",15.24mm) 包裝:管件
AT89C51RD2-RLTUM 功能描述:8位微控制器 -MCU C51RD2 64K FLASH 3-5.5V Ind RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
AT89C51RD2-SLRIM 功能描述:IC MCU FLASH 8051 EEP 64K 44PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:89C 標準包裝:1,500 系列:AVR® ATtiny 核心處理器:AVR 芯體尺寸:8-位 速度:16MHz 連通性:I²C,LIN,SPI,UART/USART,USI 外圍設備:欠壓檢測/復位,POR,PWM,溫度傳感器,WDT 輸入/輸出數(shù):16 程序存儲器容量:8KB(4K x 16) 程序存儲器類型:閃存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 11x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:20-SOIC(0.295",7.50mm 寬) 包裝:帶卷 (TR)
AT89C51RD2-SLRUM 功能描述:8位微控制器 -MCU C51RD2 64K FLASH 3-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
AT89C51RD2-SLSIM 功能描述:IC 8051 MCU FLASH 64K 44PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:89C 標準包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設備:POR,WDT 輸入/輸出數(shù):32 程序存儲器容量:32KB(32K x 8) 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP(0.600",15.24mm) 包裝:管件