DPLL Control B

Name:
DPLLCTRLB
Offset:
0x30 [ID-00001eee]
Reset:
0x00
Access:
Enable-Protected, PAC Write-Protection
Bit3130292827262524
DIV[10:8]
AccessR/WR/WR/W
Reset000
Bit2322212019181716
DIV[7:0]
AccessR/WR/WR/WR/WR/WR/WR/WR/W
Reset00000000
Bit15141312111098
LBYPASSLTIME[2:0]
AccessR/WR/WR/WR/W
Reset0000
Bit76543210
REFCLK[1:0]WUFLPENFILTER[1:0]
AccessR/WR/WR/WR/WR/WR/W
Reset000000

Bits 26:16 – DIV[10:0]: Clock Divider

Clock Divider

These bits set the XOSC clock division factor and can be calculated with following formula:

fDIV=fXOSC2x(DIV+1)

Bit 12 – LBYPASS: Lock Bypass

Lock Bypass

ValueDescription
0 DPLL Lock signal drives the DPLL controller internal logic.
1 DPLL Lock signal is always asserted.

Bits 10:8 – LTIME[2:0]: Lock Time

Lock Time

These bits select the lock time-out value:

ValueNameDescription
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

Bits 5:4 – REFCLK[1:0]: Reference Clock Selection

Reference Clock Selection

Write these bits to select the DPLL clock reference:

ValueNameDescription
0x0 XOSC32K XOSC32K clock reference
0x1 XOSC XOSC clock reference
0x2 GCLK GCLK clock reference
0x3 Reserved  

Bit 3 – WUF: Wake Up Fast

Wake Up Fast

ValueDescription
0 DPLL clock is output after startup and lock time.
1 DPLL clock is output after startup time.

Bit 2 – LPEN: Low-Power Enable

Low-Power Enable

ValueDescription
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.

Bits 1:0 – FILTER[1:0]: Proportional Integral Filter Selection

Proportional Integral Filter Selection

These bits select the DPLL filter type:

ValueNameDescription
0x0 DEFAULT Default filter mode
0x1 LBFILT Low bandwidth filter
0x2 HBFILT High bandwidth filter
0x3 HDFILT High damping filter