T89C5115-RATIM datasheet(35/113 Pages) ATMEL

35 / 113 page

AT89C5115

4128F–8051–05/06

Status of the Flash Memory

The bit FBUSY in FCON register is used to indicate the status of programming.

FBUSY is set when programming is in progress.

Selecting FM1

The bit ENBOOT in AUXR1 register is used to map FM1 from F800h to FFFFh.

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 14:

•

Save then disable interrupt and 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.

•

unmap the column latch and Restore Interrupt

T89C5115-RATIM Datasheet(PDF) 35 Page - ATMEL Corporation