Datasheet

1037
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
This register can only be written if the WPEN bit is cleared in ACC Write Protection Mode Register.
• ISEL: Current Selection
Refer to the section on ACC electrical characteristics in the datasheet.
0 (LOPW): Low-power option.
1 (HISP): High-speed option.
• HYST: Hysteresis Selection
0 to 3: Refer to the section on ACC electrical characteristics in the datasheet.
41.7.8 ACC Write Protection Mode Register
Name: ACC_WPMR
Address: 0x400400E4
Access: Read/Write
Reset: See Table 41-3
• WPEN: Write Protection Enable
0: Disables the write protection if WPKEY corresponds to 0x414343 (“ACC” in ASCII).
1: Enables the write protection if WPKEY corresponds to 0x414343 (“ACC” in ASCII).
See “Register Write Protection” on page 1030 for the list of registers that can be write-protected.
• WPKEY: Write Protection Key
––––––––
76543210
––––– HYST ISEL
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
0x414343 PASSWD
Writing any other value in this field aborts the write operation of the WPEN bit.
Always reads as 0.