Pni ASIC Manual de usuario descargar pdf (Pagina 12)

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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Pni ASIC Manual de usuario Pagina 12