SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 322

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

20.2.5.7
20.2.5.8
322
322
SAM3X/A
SAM3X/A
SAM3X/A Flash Select EEFC Command
Memory Write Command
Table 20-14. Set Security Bit Command
Once the security bit is set, it is not possible to access FFPI. The only way to erase the security
bit is to erase the Flash.
In order to erase the Flash, the user must perform the following:
Then it is possible to return to FFPI mode and check that Flash is erased.
The commands WPx, EA, xLB, xFB are executed using the current EFC controller. The default
EEFC controller is EEFC0. The Select EEFC command (SEFC) allows selection of the current
EEFC controller.
Table 20-15. Select EFC Command
This command is used to perform a write access to any memory location.
The Memory Write command (WRAM) is optimized for consecutive writes. Write handshaking
can be chained; an internal address buffer is automatically increased.
Step
1
2
Step
1
2
• Power-off the chip
• Power-on the chip with TST = 0
• Assert Erase during a period of more than 220 ms
• Power-off the chip
Handshake Sequence
Write handshaking
Write handshaking
Handshake Sequence
Write handshaking
Write handshaking
MODE[3:0]
CMDE
DATA
MODE[3:0]
CMDE
DATA
DATA[15:0]
SEFC
0 = Select EEFC0
1 = Select EEFC1
DATA[15:0]
SSE
0
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12