Datasheet

Table Of Contents
749
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
39.12.12 TWI Write Protection Mode Register
Name: TWI_WPMR
Addresses: 0xF80100E4 (0), 0xF80140E4 (1)
Access: Read-write
WPEN: Write Protect Enable
0: Disables the Write Protect if WPKEY corresponds to 0x545749 (“TWI” in ASCII).
1: Enables the Write Protect if WPKEY corresponds to 0x545749 (“TWI” in ASCII).
The write protected registers are:
“TWI Clock Waveform Generator Register”
“TWI Slave Mode 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
0x545749 PASSWD
Writing any other value in this field aborts the write operation of the WPEN bit.
Always reads as 0