参数资料
型号: AT89C51AC2-RLTUM
厂商: Atmel
文件页数: 59/121页
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44VQFP
产品培训模块: MCU Product Line Introduction
标准包装: 800
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LQFP
包装: 托盘
产品目录页面: 616 (CN2011-ZH PDF)
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
42
A/T89C51AC2
4127H–8051–02/08
Figure 24. Reading Procedure
Note:
1. aa = 10 for the Hardware Security Byte.
Flash Protection from Parallel
Programming
The three lock bits in Hardware Security Byte (see "In-System-Programming" section)
are programmed according to Table 26 provide different level of protection for the on-
chip code and data located in FM0 and FM1.
The only way to write these bits are the parallel mode. They are set by default to level 4
Table 26. Program Lock bit
Program Lock bits
U: unprogrammed
P: programmed
WARNING: Security level 2 and 3 should only be programmed after Flash and Core
verification.
Preventing Flash Corruption
Flash Spaces Reading
Flash Spaces Mapping
FCON = 0000aa0b
(1)
Data Read
DPTR = Address
ACC = 0
Exec: MOVC A, @A+DPTR
Clear Mode
FCON = 00h
Program Lock Bits
Protection Description
Security
Level
LB0
LB1
LB2
1
U
No program lock features enabled. MOVC instruction executed from
external program memory returns non coded data.
2
P
U
MOVC instructions executed from external program memory are barred
to return code bytes from internal memory, EA is sampled and latched
on reset, and further parallel programming of the Flash is disabled.
3
U
P
U
Same as 2, also verify through parallel programming interface is
disabled.
4
U
P
Same as 3, also external execution is disabled if code roll over beyond
7FFFh
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