SAM7S256_14 Datasheet, PDF (140/775 Pages) ATMEL Corporation – ARM-based Flash MCU

All lock bits must be deactivated before using the Full Erase command. This can be done by using the CLB
command.
Table 20-24. Full Erase Command
Read/Write
DR Data
Write
EA
20.3.4.4 Flash Lock Commands
Lock bits can be set using WPL or EWPL commands. They can also be set by using the Set Lock command
(SLB). With this command, several lock bits can be activated at the same time. Bit 0 of Bit Mask corresponds to the
first lock bit and so on.
In the same way, the Clear Lock command (CLB) is used to clear lock bits. All the lock bits can also be cleared by
the EA command.
Table 20-25. Set and Clear Lock Bit Command
Read/Write
DR Data
Write
SLB or CLB
Write
Bit Mask
Lock bits can be read using Get Lock Bit command (GLB). When a bit set in the Bit Mask is returned, then the cor-
responding lock bit is active.
Table 20-26. Get Lock Bit Command
Read/Write
DR Data
Write
GLB
Read
Bit Mask
20.3.4.5 Flash General-purpose NVM Commands
General-purpose NVM bits (GP NVM) can be set with the Set GPNVM command (SGPB). Using this command,
several GP NVM bits can be activated at the same time. Bit 0 of Bit Mask corresponds to the first GPNVM bit and
so on.
In the same way, the Clear GPNVM command (CGPB) is used to clear GP NVM bits. All the general-purpose NVM
bits are also cleared by the EA command.
Table 20-27. Set and Clear General-purpose NVM Bit Command
Read/Write
DR Data
Write
SGPB or CGPB
Write
Bit Mask
GP NVM bits can be read using Get GPNVM Bit command (GGPB). When a bit set in the Bit Mask is returned,
then the corresponding GPNVM bit is set.
Table 20-28. Get General-purpose NVM Bit Command
Read/Write
DR Data
Write
GGPB
Read
Bit Mask
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
140