Datasheet

362
11011B–ATARM–21-Feb-12
SAM3N
24.15.8 PMC Clock Generator Main Clock Frequency Register
Name: CKGR_MCFR
Address: 0x400E0424
Access: Read-only
This register can only be written if the WPEN bit is cleared in “PMC Write Protect Mode Register” on page 374.
• MAINF: Main Clock Frequency
Gives the number of Main Clock cycles within 16 Slow Clock periods.
• MAINFRDY: Main Clock Ready
0 = MAINF value is not valid or the Main Oscillator is disabled.
1 = The Main Oscillator has been enabled previously and MAINF value is available.
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
–––––––MAINFRDY
15 14 13 12 11 10 9 8
MAINF
76543210
MAINF