T89C51AC2-RLSI-M datasheet(24/117 Pages) ATMEL

tên linh kiện	T89C51AC2-RLSI-M

Giải thích chi tiết về linh kiện	8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM

PDF	117 Pages

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nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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24 / 117 page

Draft.A - March 30, 2001

Preview - Confidential

T89C51AC2

7.4.5. 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 column 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 12:

• 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 12. Column Latches Loading Procedure

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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