Datasheet

955
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
38.8.22 USART Write Protection Mode Register
Name: US_WPMR
Address: 0x400A00E4 (0), 0x400A40E4 (1)
Access: Read/Write
Reset: See Table 38-16
 WPEN: Write Protection Enable
0: Disables the write protection if WPKEY corresponds to 0x555341 (“USA” in ASCII).
1: Enables the write protection if WPKEY corresponds to 0x555341 (“USA” in ASCII).
See Section 38.7.10 “Register Write Protection” for the list of registers that can be write-protected.
 WPKEY: Write Protection Key
31 30 29 28 27 26 25 24
WPKEY
23 22 21 20 19 18 17 16
WPKEY
15 14 13 12 11 10 9 8
WPKEY
76543210
———————WPEN
Value Name Description
0x555341 PASSWD
Writing any other value in this field aborts the write operation of the WPEN bit. Always reads
as 0.