參數(shù)資料
型號: AT89C51RD2-SLRUM
廠商: Atmel
文件頁數(shù): 6/137頁
文件大?。?/td> 0K
描述: IC MCU FLASH 8051 EEP 64K 44PLCC
產(chǎn)品培訓模塊: MCU Product Line Introduction
標準包裝: 1
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-LCC(J 形引線)
包裝: 標準包裝
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
其它名稱: AT89C51RD2-SLRUMDKR
103
4235K–8051–05/08
AT89C51RD2/ED2
24.8
Functional Description
24.8.1
Software Security Bits (SSB)
The SSB protects any Flash access from ISP command.
The command "Program Software Security Bit" can only write a higher priority level.
There are three levels of security:
level 0: NO_SECURITY (FFh)
This is the default level.
From level 0, one can write level 1 or level 2.
level 1: WRITE_SECURITY (FEh)
For this level it is impossible to write in the Flash memory, BSB and SBV.
The Bootloader returns ’P’ on write access.
From level 1, one can write only level 2.
level 2: RD_WR_SECURITY (FCh
The level 2 forbids all read and write accesses to/from the Flash/EEPROM memory.
The Bootloader returns ’L’ on read or write access.
Only a full chip erase in parallel mode (using a programmer) or ISP command can reset the soft-
ware security bits.
From level 2, one cannot read and write anything.
Table 24-7.
Software Security Byte Behavior
24.8.2
Full Chip Erase
The ISP command "Full Chip Erase" erases all user Flash memory (fills with FFh) and sets
some bytes used by the bootloader at their default values:
BSB = FFh
Level 0
Level 1
Level 2
Flash/EEPROM
Any access allowed
Read-only access allowed
Any access not allowed
Fuse Bit
Any access allowed
Read-only access allowed
Any access not allowed
BSB & SBV
Any access allowed
Read-only access allowed
Any access not allowed
SSB
Any access allowed
Write level 2 allowed
Read-only access allowed
Manufacturer Info
Read-only access allowed
Bootloader Info
Read-only access allowed
Erase Block
Allowed
Not allowed
Full Chip Erase
Allowed
Blank Check
Allowed
相關PDF資料
PDF描述
VE-23V-IY-F2 CONVERTER MOD DC/DC 5.8V 50W
VE-23V-IY-F1 CONVERTER MOD DC/DC 5.8V 50W
D-621-0424 CONN JACK TRIAXIAL W/SOCKET
5221629-6 CONN TERMINATR PLUG BNC 93OHM AU
VE-23T-IY-F2 CONVERTER MOD DC/DC 6.5V 50W
相關代理商/技術參數(shù)
參數(shù)描述
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-SLSUM 功能描述:8位微控制器 -MCU 64kB Flash 2048B RAM 2.7V-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-SLSUM 制造商:Atmel Corporation 功能描述:IC 8BIT MCU C51/C251 60MHZ 44-PLCC
AT89C51RD2-SMSIM 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Flash Microcontroller
AT89C51RD2-SMSUM 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Flash Microcontroller