Automatic Clock Selection Register (Pxi-6528 Only) - National Instruments 6509 Programmer's Manual

Automatic Clock Selection Register (PXI-6528 Only)

This register enables/disables automatic clock selection (selecting between the PXI 10 MHz
backplane clock and the 10 MHz onboard oscillator), and gives which clock is currently being
used.
Address Offset: 0x14
Type:
Size:
Bit Map:
7 6
Reserved Reserved
Bit
7–2
1
0
© National Instruments Corporation
Bit 0: Write-only
Bit 1: Read-only
8-bit
5 4
Reserved Reserved
Name
Reserved
SystemClockStatus
AutomaticClockDisable
Chapter 2
3 2
Reserved Reserved
Description
Write only zeros to these bits.
Bit 1 indicates which clock is currently being
used as the system clock (SClk). A 0 indicates
the PXI 10 MHz backplane clock is being used.
A 1 indicates the 10 MHz onboard oscillator is
being used.
Bit 0 has a default value of 0, which means
automatic clock selection is enabled. Write a 1 to
bit 0 to disable automatic clock selection and
force use of the onboard oscillator.
2-19 Static DIO Register-Level Programmer Manual
Register Map and Descriptions
1 0
SClkStat AutoClkDis