DPLL Control B
Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
DIV[10:8] | |||||||||
Access | R/W | R/W | R/W | ||||||
Reset | 0 | 0 | 0 |
Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
DIV[7:0] | |||||||||
Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
LBYPASS | LTIME[2:0] | ||||||||
Access | R/W | R/W | R/W | R/W | |||||
Reset | 0 | 0 | 0 | 0 |
Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
REFCLK[1:0] | WUF | LPEN | FILTER[1:0] | ||||||
Access | R/W | R/W | R/W | R/W | R/W | R/W | |||
Reset | 0 | 0 | 0 | 0 | 0 | 0 |
Clock Divider
These bits set the XOSC clock division factor and can be calculated with following formula:
Lock Bypass
Value | Description |
---|---|
0 | DPLL Lock signal drives the DPLL controller internal logic. |
1 | DPLL Lock signal is always asserted. |
Lock Time
These bits select the lock time-out value:
Value | Name | Description |
---|---|---|
0x0 | Default | No time-out. Automatic lock. |
0x1 | Reserved | |
0x2 | Reserved | |
0x3 | Reserved | |
0x4 | 8MS | Time-out if no lock within 8ms |
0x5 | 9MS | Time-out if no lock within 9ms |
0x6 | 10MS | Time-out if no lock within 10ms |
0x7 | 11MS | Time-out if no lock within 11ms |
Reference Clock Selection
Write these bits to select the DPLL clock reference:
Value | Name | Description |
---|---|---|
0x0 | XOSC32K | XOSC32K clock reference |
0x1 | XOSC | XOSC clock reference |
0x2 | GCLK | GCLK_DPLL clock reference |
0x3 | Reserved | - |
Wake Up Fast
Value | Description |
---|---|
0 | DPLL clock is output after startup and lock time. |
1 | DPLL clock is output after startup time. |
Low-Power Enable
Value | Description |
---|---|
0 | The low-power mode is disabled. Time to Digital Converter is enabled. |
1 | The low-power mode is enabled. Time to Digital Converter is disabled. This will improve power consumption but increase the output jitter. |
Proportional Integral Filter Selection
These bits select the DPLL filter type:
Value | Name | Description |
---|---|---|
0x0 | DEFAULT | Default filter mode |
0x1 | LBFILT | Low bandwidth filter |
0x2 | HBFILT | High bandwidth filter |
0x3 | HDFILT | High damping filter |