Atmel SAM4S Xplained Pro Starter and Evaluation Kit ATSAM4S-XPRO ATSAM4S-XPRO Data Sheet
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Product codes
ATSAM4S-XPRO
285
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
14.5.3 Reset Controller Mode Register
Name:
RSTC_MR
Address:
0x400E1408
Access:
Read/Write
This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register
(SYSC_WPMR).
• URSTEN: User Reset Enable
0: The detection of a low level on the pin NRST does not generate a User Reset.
1: The detection of a low level on the pin NRST triggers a User Reset.
1: The detection of a low level on the pin NRST triggers a User Reset.
• URSTIEN: User Reset Interrupt Enable
0: USRTS bit in RSTC_SR at 1 has no effect on rstc_irq.
1: USRTS bit in RSTC_SR at 1 asserts rstc_irq if URSTEN = 0.
1: USRTS bit in RSTC_SR at 1 asserts rstc_irq if URSTEN = 0.
• ERSTL: External Reset Length
This field defines the external reset length. The external reset is asserted during a time of 2
(ERSTL+1)
Slow Clock cycles.
This allows assertion duration to be programmed between 60 µs and 2 seconds. Note that synchronization cycles must
also be considered when calculating the actual reset length as previously described.
• KEY: Write Access Password
31
30
29
28
27
26
25
24
KEY
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
ERSTL
7
6
5
4
3
2
1
0
–
–
URSTIEN
–
–
–
URSTEN
Value
Name
Description
0xA5
PASSWD
Writing any other value in this field aborts the write operation.
Always reads as 0.
Always reads as 0.