DAC and PLL Programming
PCVisionplus
Hardware Reference
4–11
Rev 02; February 8, 2002
4.2.9.5 Output Post Scaler (PDA) R/W
These two bits define the divide by value of the output post scaler. The default setting is 0. Refer to the Examples for
Programming PLL and XTAL mode for calculating PLL register values.
PDA
Function
0
Divide by 8
1
Divide by 4
2
Divide by 2
3
Divide by 1
4.2.9.6 Feedback Post Scaler (PDB) R/W
This bit controls the divider value of the feedback post scaler. Default setting is 3. Always program to 3.
4.2.9.7 Fine Phase Adjust Lead/Lag (LDLG) R/W
This bit sets the lead/lag relationship at the input to the PFD (programmable frequency detector). Default setting is 1.
Always use the default value of 1.
LDLG
Function
0
FBK will lag REF at input to PFD do not use
1
FBK will lead REF at input to PFD always
4.2.9.8 Fine Phase Adjust Enable (FINEEN) R/W
This bit enables an external fine adjustment of the PLL. This mode of the PLL is not used and should always be set to
disabled. The default setting is 0. Always use the default value of 0.
FINEEN
Function
0
Fine adjust disabled, always
1
Fine adjust enabled, do not use
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