Sundance SMT941 - Manual (Page 14)

User Manual SMT941 Page 14 of 43 Last Edited: 23/08/2011 17:24:00
Setting Bit 5 Description chab trigger selection
0 0 Trigger from control register selected.
1 1 Trigger from external source selected.
Setting Bit 6 Description chcd Internal trigger
0 0 No action.
1 1 Starts the data flow (converter chcd).
Setting Bit 7 Description chcd trigger selection
0 0 Trigger from control register selected.
1 1 Trigger from external source selected.
CLOCK Register 0 0x10.
Clock Register 0 0x10
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
1 Reserved Reserved CP_DIR CP_MODE DELAY_PFD REFSELCNTRL VCXO_AUX_SEL
Default ‘0’ ‘0’ ‘0’ ‘0’ ‘00’ ‘0’ ‘0’
0 SECSEL_PRISEL Reserved Reserved
Default ‘00’ ‘00’ ‘0000’
Clock Register 0 0x10
Setting Bit 7:6 Description SECSEL_PRISEL Reference Input Selection
0 00 Nothing Selected
1 01 On-board Reference selected
2 10 External Reference selected
3 11 Auto Selection (Not recommended)
Setting Bit 8 Description VCXO_AUX_SEL VCXO/AUX Selection
0 0 On-board or External Reference. Selected (SECSEL_PRI_SEL)
1 1 On-board VCXO or External Clock selected.
Setting Bit 9 Description REFSELCNTRL Reference selection mode
0 0 Reference selection made externally.
1 1 Reference selection made internally (using SECSEL_PRISEL.).
Setting Bit 11:10 Description DELAY_PFD PFD pulse width
0 00
1 01
2 10
3 11
Setting Bit 12 Description CP_MODE
0 0 3V.
1 1 5V
Setting Bit 13 Description CP_DIR
0 0 Positive CP current output
1 1 Negative CP current output