AT89C51AC3-RDTIM datasheet(48/143 Pages) ATMEL

48 / 143 page

AT89C51AC3

4383B–8051–01/05

Figure 25. 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.

Programming the Flash Spaces

User

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

Figure 26:

•

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

•

Save and 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.

•

Restore the interrupts.

Extra Row

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

Figure 26:

•

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

•

Save and Disable the interrupts.

•

Launch the programming by writing the data sequence 52h followed by A2h in

FCON register (only from FM1).

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

•

Restore 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 and Disable IT

EA = 0

Restore IT

AT89C51AC3-RDTIM 数据表(PDF) 48 Page - ATMEL Corporation

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