T89C51CC01 Atmel, T89C51CC01 Datasheet - Page 44

• Manufacturer Part Number: T89C51CC01
• Description: Enhanced 8-Bit Microcontroller
• Manufacturer: Atmel

Reading the Flash Spaces
User
Extra Row
Hardware Security Byte
44
T89C51CC01
Figure 23. Hardware Programming Procedure
The following procedure is used to read the User space:
•
Note:
The following procedure is used to read the Extra Row space and is summarized in
Figure 24:
•
•
•
The following procedure is used to read the Hardware
summarized in Figure 24:
•
•
•
Read one byte in Accumulator by executing MOVC A,@A+DPTR where A+DPTR is
the address of the code byte to read.
Map the Extra Row space by writing 02h in FCON register.
Read one byte in Accumulator by executing MOVC A,@A+DPTR with A = 0 and
DPTR = FF80h to FFFFh.
Clear FCON to unmap the Extra Row.
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 and
DPTR = 0000h.
Clear FCON to unmap the Hardware Security Byte.
FCON is supposed to be reset when not needed.
Exec: MOVX @DPTR, A
Save and Disable IT
Programming
Flash Spaces
End Loading
FCON = 0Ch
DPTR = 00h
ACC = Data
Data Load
Restore IT
EA = 0
Launch Programming
Security
Save and Disable IT
End Programming
FCON = 54h
FCON = A4h
FCON = 00h
Clear Mode
Cleared?
RestoreIT
FBusy
EA = 0
space and is
4129K–CAN–01/05