Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
362
25.12.13 PMC Programmable Clock Register
Name: PMC_PCKx
Address: 0xFFFFFC40
Access: Read/Write
• CSS: Master Clock Selection
• PRES: Programmable Clock Prescaler
• SLCKMCK: Slow Clock or Master Clock Selection
0: Slow clock is selected
1: Master clock is selected
To select between Slow Clock and Master Clock, the CSS field must be programmed to ‘00’.
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
––––––––
15 14 13 12 11 10 9 8
–––––––SLCKMCK
76543210
– – – PRES CSS
CSS Clock Source Selection
0 0 Slow Clock or Master Clock may be selected depending on SLCKMCK field.
0 1 Main Clock is selected.
1 0 PLLACK/PLLADIV2 is selected.
1 1 UPLLCK is selected.
PRES Programmable 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