参数资料
型号: AT89C51ED2-SLSUM
厂商: Atmel
文件页数: 6/137页
文件大小: 0K
描述: IC 8051 MCU FLASH 64K 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: 34
程序存储器容量: 64KB(64K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 2K 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
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
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