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1745D–ATARM–04-Nov-05
AT91M55800A
17.2.3 Reset Status Register
Register Name: SF_RSR
Access Type: Read-only
Offset: 0x08
• RESET: Reset Status Information
This field indicates whether the reset was demanded by the external system (via NRST) or by the Watchdog internal reset
request.
17.2.4 SF Protect Mode Register
Register Name: SF_PMR
Access Type: Read/Write
Reset Value: 0x0
Offset: 0x18
• PMRKEY: Protect Mode Register Key
Used only when writing SF_PMR. PMRKEY is reads 0.
0x27A8: Write access in SF_PMR is allowed.
Other value: Write access in SF_PMR is prohibited.
• AIC: AIC Protect Mode Enable (Code Label SF_AIC)
0 = The Advanced Interrupt Controller runs in Normal Mode.
1 = The Advanced Interrupt Controller runs in Protect Mode.
31 30 29 28 27 26 25 24
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23 22 21 20 19 18 17 16
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15 14 13 12 11 10 9 8
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76543210
RESET
Reset Cause of Reset Code Label
0x6C External Pin SF_EXT_RESET
0x53 Internal Watchdog SF_WD_RESET
31 30 29 28 27 26 25 24
PMRKEY
23 22 21 20 19 18 17 16
PMRKEY
15 14 13 12 11 10 9 8
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76543210
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AIC
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