Datasheet

123
6120F–ATARM–03-Oct-06
AT91SAM7X512/256/128 Preliminary
The Flash command Erase Page and Write (EWP) is equivalent to the Flash Write Com-
mand. 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.
20.2.5.3 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 com-
mand. Otherwise, the erase command is aborted and no page is erased.
20.2.5.4 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. All the lock bits
are also cleared by the EA command.
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..
20.2.5.5 Flash General-purpose NVM Commands
General-purpose NVM bits (GP NVM bits) can be set using the Set Fuse command (SFB).
This command also activates GP NVM bits. A bit mask is provided as argument to the com-
mand. When bit 0 of the bit mask is set, then the first GP NVM bit is activated.
Table 20-8. Full Erase Command
Step Handshake Sequence MODE[3:0] DATA[15:0]
1 Write handshaking CMDE EA
2 Write handshaking DATA 0
Table 20-9. 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 20-10. 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