at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 49

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

Fuse ConfigurationByte
7663B–8051–03/07
Figure 9. HSB Reading Procedure
The following procedure is used to read the Fuse Configuration byte and is sum-
marized in Figure 9:
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•
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HSB Reading Procedure
Map the FCB by writing 05h 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.
Exec: MOVC A, @A+DPTR
Exec: MOVC A, @A+DPTR
FCON = 00h (FPS = 0)
FCON = 00h (FPS = 0)
HSB Unmapping
HSB Unmapping
HSB Reading
FCB Reading
HSB Mapping
FCB Mapping
DPTR= 0000h
DPTR= 0000h
FCON = 04h
FCON = 05h
Data Read
Data Read
ACC= 00h
ACC= 00h
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