T89C51CC02CA-RATIM datasheet(39/154 Pages) ATMEL

39 / 154 page

T89C51CC02

4126H–CAN–01/05

Figure 16. Hardware Programming Procedure

Reading the Flash Spaces

User

The following procedure is used to read the User space:

•

Read one byte in Accumulator by executing MOVC A,@A+DPTR with A+DPTR is

the address of the code byte to read.

Note:

FCON must be cleared (00h) when not used.

Extra Row

The following procedure is used to read the Extra Row space and is summarized in

Figure 17:

•

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.

•

Clear FCON to unmap the Extra Row.

Hardware Security Byte

The following procedure is used to read the Hardware Security Byte and is sum-

marized in Figure 17:

•

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.

•

Clear FCON to unmap the Hardware Security Byte.

Flash Spaces

Programming

Save & Disable IT

EA = 0

Launch Programming

FCON = 54h

FCON = A4h

End Programming

RestoreIT

FBusy

Cleared?

Clear Mode

FCON = 00h

Data Load

DPTR = 00h

ACC = Data

Exec: MOVX @DPTR, A

FCON = 0Ch

Save & Disable IT

EA = 0

End Loading

Restore IT

T89C51CC02CA-RATIM Datasheet(PDF) 39 Page - ATMEL Corporation

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