User guide

PNIASIC
HostProcessorInterface
PS0, PS1, and PS2 – Period Select
Selects the division ratio applied to the L/R oscillator output to set the period being measured
.
Table 11: Period Select
PS2 PS1 PS0 Ratio
0 0 0 /32
0 0 1 /64
0 1 0 /128
0 1 1 /256
1 0 0 /512
1 0 1 /1024
1 1 0 /2048
1 1 1 /4096
ODIR – Oscillator Direction
Determines the magnetic oscillator direction if MOT is set to 1. It has no effect on direction when the MOT
bit is set to zero. This is used for debug purposes only, and will not be set in normal operation.
MOT – Magnetic Oscillator Test
When set, causes the magnetic oscillator selected by AS0 and AS1, in the directions selected by ODIR to
run continuously until PNI ASIC is reset.
ASO & ASI – Axis Select
Determines which axis is being measured.
NOTE
When 2 MHz scaling is selected, the magnetic sensor oscillator does not run. Instead, the internal
2 MHz oscillator is turned on. The 2 MHz clock cycles are counted until a command byte is sent
disabling the scaling function. A RESET stops the 2 MHz oscillator and clears all bits.
Table 12: ASO and ASI Axis Select
Function AS1 AS0
2 MHz scaling 0 0
X axis 0 1
Y axis 1 0
Z axis 1 1
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