Datasheet

841
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
40.8.29 USART Write Protect Mode Register
Name: US_WPMR
Addresses: 0xF801C0E4 (0), 0xF80200E4 (1), 0xF80240E4 (2), 0xF80280E4 (3)
Access: Read-write
Reset: See Table 40-17
• WPEN: Write Protect Enable
0: Disables the Write Protect if WPKEY corresponds to 0x555341 (“USA” in ASCII).
1: Enables the Write Protect if WPKEY corresponds to 0x555341 (“USA” in ASCII).
Protects the registers:
 “USART Mode Register”
 “USART Baud Rate Generator Register”
 “USART Receiver Time-out Register”
 “USART Transmitter Timeguard Register”
 “USART FI DI RATIO Register”
 “USART IrDA FILTER Register”
 “USART Manchester Configuration Register”
• WPKEY: Write Protect 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.