参数资料
型号: AT89C51RB2-SLSUM
厂商: Atmel
文件页数: 124/127页
文件大小: 0K
描述: IC 8051 MCU FLASH 16K 44PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 972
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
96
AT89C51RB2/RC2
4180E–8051–10/06
Functional Description
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 software security bits.
From level 2, one cannot read and write anything.
Table 71. Software Security Byte Behavior
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
相关PDF资料
PDF描述
VJ1825A152JBLAT4X CAP CER 1500PF 630V 5% NP0 1825
VJ1825A152KBEAT4X CAP CER 1500PF 500V 10% NP0 1825
VE-B30-CU-B1 CONVERTER MOD DC/DC 5V 200W
ATMEGA644PA-PU IC MCU 8BIT 64KB FLASH 40DIP
VE-B2W-IY-F4 CONVERTER MOD DC/DC 5.5V 50W
相关代理商/技术参数
参数描述
AT89C51RC 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 32K Bytes Flash
AT89C51RC_05 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 32K Bytes Flash
AT89C51RC_08 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 32K Bytes Flash
AT89C51RC2 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 16K/ 32K Bytes Flash
AT89C51RC2_0312 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Microcontroller with 16K/32K Bytes Flash