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1745D–ATARM–04-Nov-05
AT91M55800A
14.0.3 WD Clock Mode Register
Name: WD_CMR
Access: Read/Write
Reset Value: 0
Offset: 0x04
• WDCLKS: Clock Selection
• HPCV: High Pre-load Counter Value (Code Label WD_HPCV)
Counter is preloaded when watchdog counter is restarted with bits 0 to 11 set (FFF) and bits 12 to 15 equaling HPCV.
• CKEY: Clock Access Key (Code Label WD_CKEY)
Used only when writing WD_CMR. CKEY is read as 0.
0x06E: Write access in WD_CMR is allowed.
Other value: Write access in WD_CMR is prohibited.
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
––––––––
15 14 13 12 11 10 9 8
CKEY
76543210
CKEY
–
HPCV WDCLKS
WDCLKS Clock Selected
Code Label
WD_WDCLKS
0 0 MCK/32 WD_WDCLKS_MCK32
0 1 MCK/128 WD_WDCLKS_MCK128
1 0 MCK/1024 WD_WDCLKS_MCK1024
1 1 MCK/4096 WD_WDCLKS_MCK4096