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AT89C5130A-RDTIM Folha de dados(PDF) 41 Page - ATMEL Corporation

Nome de Peças AT89C5130A-RDTIM
Descrição Electrónicos  8-bit Flash Microcontroller with Full Speed USB Device
PDF  184 Pages
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5130A-RDTIM Folha de dados(HTML) 41 Page - ATMEL Corporation

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41
AT89C5130A/31A-M
4337C–USB–02/05
Table 43. Program Lock Bits of the SSB
Notes:
1. U: unprogrammed or "one" level.
2. P: programmed or “zero” level.
3. X: don’t care
4. WARNING: Security level 2 and 3 should only be programmed after Flash and code
verification.
Flash Memory Status
AT89C5130A/31A-M parts are delivered with the ISP boot in the Flash memory. After
ISP or parallel programming, the possible contents of the Flash memory are summa-
rized in Figure 19:
Figure 19. Flash Memory Possible Contents
Memory Organization
In the AT89C5130A/31A-M, the lowest 16/32K of the 64 Kbyte program memory
address space is filled by internal Flash.
When the EA is pin high, the processor fetches instructions from internal program Flash.
Bus expansion for accessing program memory from 16/32K upward is 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. If all storage is on chip, then byte location 3FFFh (16K) or 7FFFh
(32K) should be left vacant to prevent and undesired pre-fetch from external program
memory address 4000h (16K) or 8000h (32K).
Program Lock Bits
Protection Description
Security
Level
LB0
LB1
1
U
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
Default
Virgin
After ISP
After parallel
programming
After parallel
programming
After parallel
programming
Application
Application
After ISP
or
Dedicated
ISP
Dedicated
ISP
7FFFh AT89C5131A-M
Application
Virgin
or
Application
Virgin
or
Application
3FFFh AT89C5130A-M



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