SAM3SD8B Atmel Corporation, SAM3SD8B Datasheet - Page 306

• Manufacturer Part Number: SAM3SD8B
• Manufacturer: Atmel Corporation

Table 18-3.
18.4.3.2
306
306
Symbol
FL_ID
FL_SIZE
FL_PAGE_SIZE
FL_NB_PLANE
FL_PLANE[0]
...
FL_PLANE[FL_NB_PLANE-1]
FL_NB_LOCK
FL_LOCK[0]
...
SAM3S8/SD8
SAM3S8/SD8
Write Commands
Flash Descriptor Definition
Several commands can be used to program the Flash.
Flash technology requires that an erase be done before programming. The full memory plane
can be erased at the same time, or several pages can be erased at the same time (refer to
ure 18-7, "Example of Partial Page
page erase can be automatically done before a page write using EWP or EWPL commands.
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 or EWPL commands.
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 is repeated as many times as the number of pages within this address space.
Note:
Write operations are performed in a number of wait states equal to the number of wait states for
read operations.
Data are written to the latch buffer before the programming command is written to the Flash
Command Register EEFC_FCR. The sequence is as follows:
• Write the full page, at any page address, within the internal memory area address space.
• 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
(EEFC_FSR) is automatically cleared.
Writing of 8-bit and 16-bit data is not allowed and may lead to unpredictable data corruption.
Word Index
0
1
2
3
4
4 + FL_NB_PLANE - 1
4 + FL_NB_PLANE
4 + FL_NB_PLANE + 1
Programming", and the paragraph below the figure.). Also, a
Number of bytes in the first lock region.
Description
Flash Interface Description
Flash size in bytes
Page size in bytes
Number of planes. A plane can be
erased or written while read operations
are performed on another plane (only for
SAM3SD8).
Number of bytes in the first plane.
Number of bytes in the last plane.
Number of lock bits. A bit is associated
with a lock region. A lock bit is used to
prevent write or erase operations in the
lock region.
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12
Fig-