at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 66

• Manufacturer Part Number: at89c51re2-slsem
• Description: At89c51re2 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

Reading commands
FLASH
CONFIGURATION
SECURITY
BOOTLOADER
SIGNATURE
7663B–8051–03/07
The reading command is supported by the following areas :
Table 35. Memory space & Select page
The reading command on the Flash memory can be done from address 000h to
1FFFFh. The read operation is only possible if the HSB (Hardware Security Byte) has a
security level lower than or equal to ‘2’ (FLB2.0 = ‘110’)
Table 36. Flash Read Autorisation Summary
The CONFIGURATION family can always be read.
The SECURITY family can always be read.
All the field from the BOOTLOARED family can be read from the bootloader. Each boot-
loader information shall be read unitary. Accesses must be done byte per byte
according to the address definition
All the field from the SIGNATURE family can be read from the bootloader. Each signa-
ture information shall be read unitary. Accesses must be done byte per byte according
to the address definition
FLASH
SECURITY
CONFIGURATION
BOOTLOADER
SIGNATURE
Read
Memory/Information Family
Command
Allowed
111
Allowed
Security level (HSB)
110
need security level check
Comments/Restriction
FLB2:0
Forbidden
101
Forbidden
011
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