AT89C5131-RDTIL datasheet(30/176 Pages) ATMEL

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AT89C5131

4136B–USB–09/03

Loading the Column Latches

Any number of data from 1 byte to 128 bytes can be loaded in the column latches. This

provides the capability to program the whole memory by byte, by page or by any number

of bytes in a page.

When programming is launched, an automatic erase of the locations loaded in the col-

umn latches is first performed, then programming is effectively done. Thus, no page or

block erase is needed and only the loaded data are programmed in the corresponding

page.

The following procedure is used to load the column latches and is summarized in

Figure 15:

•

Map the column latch space by setting FPS bit.

•

Load the DPTR with the address to load.

•

Load Accumulator register with the data to load.

•

Execute the MOVX @DPTR, A instruction.

•

If needed loop the three last instructions until the page is completely loaded.

Figure 15. Column Latches Loading Procedure

Programming the Flash Spaces

User

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

Figure 16:

•

Load data in the column latches from address 0000h to 7FFFh(1).

•

Disable the interrupts.

•

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

FCON register.

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

•

Enable the interrupts.

Note:

1. The last page address used when loading the column latch is the one used to select

the page programming address.

Column Latches

Data Load

DPTR = Address

ACC = Data

Exec: MOVX @DPTR, A

Last Byte

to load?

Column Latches Mapping

FPS = 1

Data memory Mapping

FPS = 0

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