Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesARM Processor Microcontroller QFP 64

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6120F–ATARM–03-Oct-06

AT91SAM7X512/256/128 Preliminary

Figure 19-6. Example of Partial Page Programming:

After programming, the page (the whole lock region) can be locked to prevent miscellaneous

write or erase sequences. The lock bit can be automatically set after page programming using

WPL.

Data to be written are stored in an internal latch buffer. The size of the latch buffer corresponds

to the page size. The latch buffer wraps around within the internal memory area address space

and appears to be repeated by the number of pages in it.

Note: Writing of 8-bit and 16-bit data is not allowed and may lead to unpredictable data corruption.

Data are written to the latch buffer before the programming command is written to the Flash

Command Register MC_FCR. The sequence is as follows:

• Write the full page, at any page address, within the internal memory area address space

using only 32-bit access.

• Programming starts as soon as the page number and the programming command are written

to the Flash Command Register. The FRDY bit in the Flash Programming Status Register

(MC_FSR) is automatically cleared.

• When programming is completed, the bit FRDY in the Flash Programming Status Register

(MC_FSR) rises. If an interrupt was enabled by setting the bit FRDY in MC_FMR, the

interrupt line of the Memory Controller is activated.

Two errors can be detected in the MC_FSR register after a programming sequence:

• Programming Error: A bad keyword and/or an invalid command have been written in the

MC_FCR register.

• Lock Error: The page to be programmed belongs to a locked region. A command must be

previously run to unlock the corresponding region.

19.2.4.2 Erase All Command

The entire memory can be erased if the Erase All Command (EA) in the Flash Command Regis-

ter MC_FCR is written.

Erase All Flash

Programming of the second part of Page 7 Programming of the third part of Page 7

32 bits wide

32 bits wide 32 bits wide

16 words

FF FF FF FF

...

CA FE CA FE

FF FF FF FF

CA FE CA FE

DE CA DE CA

FF FF FF FF

Step 1.

Step 2.

Step 3.

...

(NEBP = 1)

16 words

Page 7 erased