Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
360
25.12.12 PMC Master Clock Register
Name: PMC_MCKR
Address: 0xFFFFFC30
Access: Read/Write
• CSS: Master/Processor Clock Source Selection
• PRES: Master/Processor Clock Prescaler
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
––––––––
15 14 13 12 11 10 9 8
–––PLLADIV2–– MDIV
76543210
– – – PRES CSS
CSS Clock Source Selection
0 0 Slow Clock is selected.
0 1 Main Clock is selected.
1 0 PLLA Output clock is selected.
1 1 UPLL Output clock is selected.
PRES Master/Processor Clock Dividers Input Clock
0 0 0 Selected clock
0 0 1 Selected clock divided by 2
0 1 0 Selected clock divided by 4
0 1 1 Selected clock divided by 8
1 0 0 Selected clock divided by 16
1 0 1 Selected clock divided by 32
1 1 0 Selected clock divided by 64
111Reserved