In SX Microcontrollers, SX/B Compiler and SX-Key Tool, jfischer wrote:

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<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">I have an application that I have developed and integrated a <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:stockticker><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"><st1:stockticker>PLC</st1:stockticker></st1:stockticker><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"> to perform the functions.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">The <st1:stockticker><st1:stockticker><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">PLC</st1:stockticker></st1:stockticker><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"> is not precise enough for the job, the period and frequency of the PLC output varies.......<o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"><SPAN style="COLOR: black"><o:p>I need to change to a different type of controller.</o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">The application uses an optical quadrature encoder to provide direct position feed back from a physical, process by incrementing or decrementing a counter.<SPAN style="COLOR: black"><o:p></o:p>

<SPAN style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: Verdana">(Quadrature encoder is a device that produces two square wave signals, 90 degrees out of phase, each with a 50% duty cycle)<SPAN style="COLOR: black"><o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"><SPAN style="COLOR: black"><o:p></o:p> 

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">A single event will occur with each revolution of the quadrature encoder.

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">The encoder will turn about 300 RPM.

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">The encoder has a resolution of 1000 pulses per revolution.

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">The event will be triggered by a comparator that compares the encoder count with a preset value.<SPAN style="COLOR: black"><o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">When the preset value in the comparator equals the counter value of the quadrature encoder, one square wave pulse will be generated on an output line to trigger the event. (Once for each true compare cycle)<o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">The encoder counter will be compared counting up or down.

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">The compare frequency will be about 5hz 

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">Using one of the SX products, <SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">A chip like an <st1:stockticker><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">HCTL</st1:stockticker><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">-2032 decoder/counter could be interfaced with the controller or code will have to be written for a decoder/counter using the standard inputs.

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">Has any one used an SX for a quadrature counter/comparator application?

[3][/3]

<o:p>[3]jfischer [/3]</o:p>

<o:p>[3][/3]</o:p> 

[3]Notes on the <st1:stockticker>HCTL</st1:stockticker>-2032 decoder/counter IC<o:p></o:p>[/3]

[3]The <st1:stockticker>HCTL</st1:stockticker>-2032 is a <st1:stockticker>CMOS</st1:stockticker> IC that perform the quadrature decoder, counter, and bus interface function. The <st1:stockticker>HCTL</st1:stockticker>-2032 is designed to improve system performance in digital closed loop motion control systems and digital data input systems. It does this by shifting time intensive quadrature decoder functions to a cost effective hardware solution. The <st1:stockticker>HCTL</st1:stockticker>-2032 consists of 4x/2x/1x-quadrature decoder, a binary up/down state counter, and an 8-bit bus interface. The <st1:stockticker>HCTL</st1:stockticker>-2032 has the dual-axis capability and index channel counter. The use of Schmitt-triggered <st1:stockticker>CMOS</st1:stockticker> inputs and input noise filters allows reliable operation in noisy environments. The <st1:stockticker>HCTL</st1:stockticker>-2032 contains 32-bit counter. It also contains quadrature decoder output signals and cascade signals for use with many standard computer ICs. The <st1:stockticker>HCTL</st1:stockticker>-2032 provides LSTLL compatible tri-state output buffers. Operation is specified for a temperature range from -40 degrees C to +100 degrees C at clock frequencies up to 33MHz.[/3]

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