参数资料
型号: AT89EB5114-TGSIL
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: Low-pin-count 8-bit microcontroller with A/D converter
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDSO20
封装: SO-20
文件页数: 78/95页
文件大小: 1126K
代理商: AT89EB5114-TGSIL
78
4311A–8051–01/05
The following procedure is used to read the Hardware
Security
space and is
summarized in Figure 37:
Map the Hardware Security space by writing 04h in FCON register.
Read the byte in Accumulator by executing MOVC A,@A+DPTR with A= 0 &
DPTR= 0000h.
Clear FCON to unmap the Hardware Security Byte.
Figure 37.
Reading Procedure
Flash Protection from Parallel
Programming
The three lock bits in Hardware Security Byte are programmed according to Table 58,
will provide different level of protection for the on-chip code and data located in flash
memory.
The only way for write this bits are the parallel mode.
Table 58.
Program Lock Bit
WARNING: Security level 2 and 3 should only be programmed after Flash and Core
verification.
Flash Spaces Reading
Flash Spaces Mapping
FCON= 00000xx0b
Data Read
DPTR= Address
ACC= 0
Exec: MOVC A, @A+DPTR
Erase Mode
FCON = 00h
Program Lock Bits
Protection Description
Security
level
LB1
LB0
1
U
U
No program lock feature enabled.
2
U
P
Writing Flash data from programmer is disabled but still allowed from
internal code execution.
3
P
U
Writing and reading Flash data from programmer is disabled but still
allowed from internal code execution.
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