Datasheet

370
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
writes to the first pages of the lock region using Flash write commands and writes to the last page of the lock region using
a Flash write and lock command.
The Flash command Erase Page and Write (EWP) is equivalent to the Flash Write Command. However, before
programming the load buffer, the page is erased.
The Flash command Erase Page and Write the Lock (EWPL) combines EWP and WPL commands.
21.3.5.3 Flash Full Erase Command
This command is used to erase the Flash memory planes.
All lock regions must be unlocked before the Full Erase command by using the CLB command. Otherwise, the erase
command is aborted and no page is erased.
21.3.5.4 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. A Bit Mask is provided as argument to the command. When bit 0 of the
bit mask is set, then the first lock bit is activated.
In the same way, the Clear Lock command (CLB) is used to clear lock bits.
Lock bits can be read using Get Lock Bit command (GLB). The n
th
lock bit is active when the bit n of the bit mask is set..
21.3.5.5 Flash General-purpose NVM Commands
General-purpose NVM bits (GP NVM bits) can be set using the Set GPNVM command (SGPB). This command also
activates GP NVM bits. A bit mask is provided as argument to the command. When bit 0 of the bit mask is set, then the
first GP NVM bit is activated.
In the same way, the Clear GPNVM command (CGPB) is used to clear general-purpose NVM bits. The general-purpose
NVM bit is deactivated when the corresponding bit in the pattern value is set to 1.
Table 21-8. Full Erase Command
Step Handshake Sequence MODE[3:0] DATA[15:0]
1 Write handshaking CMDE EA
2 Write handshaking DATA 0
Table 21-9. Set and Clear Lock Bit Command
Step Handshake Sequence MODE[3:0] DATA[15:0]
1 Write handshaking CMDE SLB or CLB
2 Write handshaking DATA Bit Mask
Table 21-10. Get Lock Bit Command
Step Handshake Sequence MODE[3:0] DATA[15:0]
1 Write handshaking CMDE GLB
2 Read handshaking DATA
Lock Bit Mask Status
0 = Lock bit is cleared
1 = Lock bit is set
Table 21-11. Set/Clear GP NVM Command
Step Handshake Sequence MODE[3:0] DATA[15:0]
1 Write handshaking CMDE SGPB or CGPB
2 Write handshaking DATA GP NVM bit pattern value