Rainbow Electronics AT89C5131 - Manual (Page 33)

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AT89C5131
4136A–USB–03/03
Reading the Flash Spaces
User The following procedure is used to read the User space and is summarized in Figure 18:
• 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.
Extra Row The following procedure is used to read the Extra Row space and is summarized in
Figure 18:
• 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.
Hardware Security The following procedure is used to read the Hardware Security space and is summa-
rized in Figure 18:
• 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.
Figure 18. Reading Procedure
Flash Spaces Reading
Flash Spaces Mapping
FCON = 00000xx0b
Data Read
DPTR = Address
ACC = 0
Exec: MOVC A, @A+DPTR
Erase Mode
FCON = 00h