Maple Systems HMC7000 Series - Manual (Page 59)

HMC7000 Series I/O Module Guide
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1010-1043 Page 58 of 85 Rev. 02, 11/08/2013
Reference the table below when configuring each HSC Configuration Register:
Input Mode Output Mode Register Value
Normal Input N/A
0
High Speed,
Single Phase,
Up Counter Output ON when preset is reached
2
Output ON when counter is enabled,
OFF when preset is reached 258
Quadrature 1X Output ON when preset is reached
3
Output ON when counter is enabled,
OFF when preset is reached 259
Quadrature 2X Output ON when preset is reached
67
Output ON when counter is enabled,
OFF when preset is reached 323
Quadrature 4X Output ON when preset is reached
131
Output ON when counter is enabled,
OFF when preset is reached 387
To implement High Speed Counter Operation:
22. Connect a device that will provide the high speed pulses to one of the four High-Speed inputs on the
expansion module.
23. Configure the HSC using the configuration register for that channel.
24. Write the HSC preset count value in the Preset register for that channel.
25. Enable the HSC by setting the HSC Enable Bit that channel.
26. HSC increments the current value register for that channel until the preset value is reached.
27. Enable the HSC Reset Bit by setting for that channel. This will cause the HSC current value to reset back
to 0.
28. To start the process again, simply reset (clear) the HSC Reset Bit and set the HSC Enable Bit. Note: if the
HSC Enable Bit is still ON, you must reset (clear) this bit, and then set it again.