Q-4 (25p) A temperature sensor is connected to 8085 microprocessor bus system via ADC converter as shown below. Port address of ADC is (80)$_{16}$ It is desired to read 200 temperature measurement and they are stored into memory location starting from (C000)$_{16}$. Write an assembly language program (8085 microprocessor) for related system.
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- Set the starting memory location (C000) in a register, say HL. - Set the port address (80) in a register, say A. - Set the counter for the number of temperature measurements to be read, say B. Show more…
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An interfacing card with a 16-bit analogue-digital (A/D) converter is used to measure a PT100 Resistance Temperature Detector (RTD) temperature of range -200C to 500C. A Wheatstone Bridge is used to ease the temperature measurement in voltage. The Wheatstone Bridge is balance with zero output voltage at 0°C and produces an output of 75mv at 500C. An amplifier with a gain G = 50 is used to produces suitable input for the A/D converter. The A/D converter is set to be able to measure an input voltage of range -5V to +5V and the conversion is stored in three address registers. Determine: a. the resolution of the A/D converter. b. the minimum temperature resolution can be measured by the A/D converter c. the measured temperature if the data acquisition program read a value of 0xFACE from the A/D address registers.. Clearly show all calculations. Assume a linear relationship between the RTD temperature and the bridge output voltage.
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