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

I have built a dc voltmeter using an analog devices adc 654. The IC converts voltage into frequency. A pin on the SX can be configured as a TTL input to receive this signal. The count command can be used to count pulses over time. The main program can be written to convert pulses over time to DC volts, an the program can be configured to manipulate output pins on the SX for peripherals.
 

Hope this helps

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