DITHER=FIXED, PD=ENABLED
PLL spread spectrum control 1
| MD | M- divider value with fraction. MD[18:11] : integer portion of the feedback divider value. MD[10:0] : fractional portion of the feedback divider value. |
| MDREQ | MD reload request. When a 1 is written to this bit, the MD value is loaded into the PLL. This bit is cleared when the load is complete. |
| MF | Programmable modulation frequency fm = Fref/Nss with Fref = Fin/N 0b000 => Nss = 512 (fm = 3.9 - 7.8 kHz) 0b001 => Nss = 384 (fm = 5.2 - 10.4 kHz) 0b010 => Nss = 256 (fm = 7.8 - 15.6 kHz) 0b011 => Nss = 128 (fm = 15.6 - 31.3 kHz) 0b100 => Nss = 64 (fm = 32.3 - 64.5 kHz) 0b101 => Nss = 32 (fm = 62.5- 125 kHz) 0b110 => Nss = 24 (fm = 83.3- 166.6 kHz) 0b111 => Nss = 16 (fm = 125- 250 kHz) |
| MR | Programmable frequency modulation depth deltafmodpk-pk = Fref x k/Fcco = k/MDdec 0 = no spread 0b000 => k = 0 (no spread spectrum) 0b001 => k = 1 0b010 => k = 1.5 0b011 => k = 2 0b100 => k = 3 0b101 => k = 4 0b110 => k = 6 0b111 => k = 8 |
| MC | Modulation waveform control 0 = no compensation Compensation for low pass filtering of the PLL to get a triangular modulation at the output of the PLL, giving a flat frequency spectrum. 0b00 => no compensation 0b10 => recommended setting 0b11 => max. compensation |
| PD | Power down. 0 (ENABLED): Enabled. Spread spectrum controller is enabled 1 (DISABLED): Disabled. Spread spectrum controller is disabled |
| DITHER | Select modulation frequency. 0 (FIXED): Fixed. Fixed modulation frequency. 1 (DITHER): Dither. Randomly dither between two modulation frequencies. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |