at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 65

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

Blank Checking commands
FLASH
48
AT89C51RE2
The blank checking command is supported by the following areas
Table 33. Memory space & Erase
Nothing is done on the other areas.
The first not erased address is returned if the blank check is failed.
The blank checking command on the Flash memory can be done from address 0000h to
1FFFFh.
The blanck check operation is only possible if the HSB (Hardware Security Byte) has a
security level lower than or equal to ‘2’ (FLB2.0 = ‘110’)
Table 34. Flash Blank check Autorisation Summary
FLASH
Blank Check
–
Memory/Information Family
Command
Allowed
111
Allowed
Security level (HSB)
110
need security level check
Comments/Restriction
FLB2:0
Forbidden
101
Forbidden
011
7663B–8051–03/07