参数资料
型号: AT89C51RC2-RLRUL
厂商: Atmel
文件页数: 118/127页
文件大小: 0K
描述: MCU 8051 32K FLASH 3V 44-VQFP
产品培训模块: MCU Product Line Introduction
标准包装: 1
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
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: 32KB(32K 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 ~ 3.6 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LQFP
包装: 标准包装
其它名称: AT89C51RC2-RLRULDKR
90
AT89C51RB2/RC2
4180E–8051–10/06
Table 69. Program Lock Bits of the SSB
Note:
U: unprogrammed or "one" level.
P: programmed or "zero" level.
X: don’t care
WARNING: Security level 2 and 3 should only be programmed after Flash and code
verification.
Flash Memory Status
AT89C51RB2/RC2 parts are delivered in standard with the ISP boot in the Flash mem-
ory. After ISP or parallel programming, the possible contents of the Flash memory are
summarized on Figure 35.
Figure 35. Flash Memory Possible Contents
Memory Organization
In the AT89C51RB2/RC2, the lowest 16K or 32K of the 64 KB program memory address
space is filled by internal Flash.
When the EA pin is high, the processor fetches instructions from internal program Flash.
Bus expansion for accessing program memory from 16K or 32K upward automatic since
external instruction fetches occur automatically when the program counter exceeds
3FFFh (16K) or 7FFFh (32K). If the EA pin is tied low, all program memory fetches are
from external memory.
Program Lock Bits
Protection Description
Security
level
LB0
LB1
1
U
No program lock features enabled.
2
P
U
ISP programming of the Flash is disabled.
3
X
P
Same as 2, also verify through ISP programming interface is disabled.
0000h
Virgin
3FFFh
Default
After ISP
After Parallel
Programming
After Parallel
Programming
Application
Virgin
After ISP
or
Dedicated
ISP
Dedicated
ISP
7FFFh T89C51RC2 32KB
T89C51RB2 16KB
Application
Virgin
or
Application
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