Rainbow-electronics T89C51AC2 Manual do Utilizador descarregar pdf (Página 35)

T89C51AC2

Rev. B – 19-Dec-01

Figure 12. Column Latches Loading Procedure

Note: The last page address used when loading the column latch is the one used to select the

page programming address.

9.3.6 Programming the FLASH

Spaces

User The following procedure is used to program the User space and is summarized in

Figure 13:

• Load up to one page of data in the column latches from address 0000h to 7FFFh.

• Disable the interrupts.

• Launch the programming by writing the data sequence 50h followed by A0h in

FCON register (only from FM1).

The end of the programming indicated by the FBUSY flag cleared.

• Enable the interrupts.

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

Figure 13:

• Load data in the column latches from address FF80h to FFFFh.

• Disable the interrupts.

Column Latches

Data Load

DPTR= Address

ACC= Data

Exec:MOVX@DPTR,A

Last Byte

to load?

Column Latches Mapping

FCON = 08h (FPS=1)

Data memory Mapping

FCON = 00h (FPS = 0)

Save & Disable IT

EA= 0

Restore IT

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