Manualshelf

Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller LQFP 48 (7x7) 16/32-Bit 55 MHz I/O number 21
131132133134135136137138139140
Table Of Contents
132
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
The Flash command Write Page and Lock (WPL) is equivalent to the Flash Write Command. However, the lock
bit is automatically set at the end of the Flash write operation. As a lock region is composed of several pages, the
programmer 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.
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 command. 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 com-
mand. 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.
... ... ... ...
n Write handshaking ADDR0 Memory Address LSB
n+1 Write handshaking ADDR1 Memory Address
n+2 Write handshaking ADDR2 Memory Address
n+3 Write handshaking ADDR3 Memory Address
n+4 Write handshaking DATA *Memory Address++
n+5 Write handshaking DATA *Memory Address++
... ... ... ...
Table 20-9. Write Command (Continued)
Step Handshake Sequence MODE[3:0] DATA[7:0]
Table 20-10. Full Erase Command
Step Handshake Sequence MODE[3:0] DATA[15:0] or DATA[7:0]
1 Write handshaking CMDE EA
2 Write handshaking DATA 0
Table 20-11. Set and Clear Lock Bit Command
Step Handshake Sequence MODE[3:0] DATA[15:0] or DATA[7:0]
1 Write handshaking CMDE SLB or CLB
2 Write handshaking DATA Bit Mask