at89c5131 ATMEL Corporation, at89c5131 Datasheet - Page 34

• Manufacturer Part Number: at89c5131
• Description: 8-bit Flash Microcontroller With Full Speed Usb Device At89c5131
• Manufacturer: ATMEL Corporation

Reading the Flash Spaces
User
Extra Row
Hardware Security
34
AT89C5131
The following procedure is used to read the User space and is summarized in Figure 18:
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•
The following procedure is used to read the Extra Row space and is summarized in
Figure 18:
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•
The following procedure is used to read the Hardware Security space and is summa-
rized in Figure 18:
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Figure 18. Reading Procedure
Map the User space by writing 00h in FCON register.
Read one byte in Accumulator by executing MOVC A, @A+DPTR with A = 0 &
DPTR = 0000h to FFFFh.
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 &
DPTR = FF80h to FFFFh.
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 &
DPTR = 0000h.
Flash Spaces Reading
Exec: MOVC A, @A+DPTR
Flash Spaces Mapping
FCON = 00000xx0b
DPTR = Address
Erase Mode
FCON = 00h
Data Read
ACC = 0
4136C–USB–04/05