Rainbow-electronics T89C51AC2 Manual de usuario descargar pdf (Pagina 37)

T89C51AC2

Rev. B – 19-Dec-01

Figure 14. Hardware Programming Procedure

9.3.7 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=read@.

Note: FCON is supposed to be reset when not needed.

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

Figure 15:

• 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 space and is

summarized in Figure 15:

• 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

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 109 110

T89C51AC2 1

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Rainbow-electronics T89C51AC2 Manual de usuario Pagina 37

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