Digital to Analog Converters in the 8085 Microprocessor

Understanding Digital to Analog Converters in the 8085 Microprocessor

Digital-to-analog converters (DACs) are used to convert digital signals into analog signals. This is necessary because many real-world signals, such as temperature, pressure, and sound, are analog in nature.

The 8085 microprocessor does not have a built-in DAC, but it can be interfaced with an external DAC. One common way to do this is to use the 8255 programmable peripheral interface (PPI) chip.

The 8255 has three 8-bit ports: A, B, and C. Port A can be configured as an output port, and it can be used to send digital data to the DAC.

To interface the 8085 with a DAC using the 8255, the following steps are performed:

1. Connect the data pins of the DAC to the data pins of port A on the 8255.
2. Connect the control pins of the DAC to the appropriate pins on the 8085 or 8255.
3. Configure port A of the 8255 as an output port.
4. Write the digital data to be converted to port A.

The following assembly language code shows how to interface the 8085 with a DAC using the 8255:

; Initialize port A of the 8255 as an output port
OUT 00 ; Select port A
MVI A, 0x00 ; Set port A as an output port
OUT 01 ; Write the new port A configuration

; Write the digital data to be converted to port A
MVI A, DATA ; Load the digital data to be converted
OUT 02 ; Write the digital data to port A

Once the digital data has been written to port A, the DAC will convert it to an analog signal. The analog signal can then be used to control an external device, such as a motor, actuator, or speaker.

Examples of using DACs with the 8085

DACs can be used in a variety of applications with the 8085. For example, DACs can be used to:

• Generate waveforms for sound synthesis.
• Control the speed of a motor.
• Set the position of an actuator.
• Generate a voltage or current reference signal.

Conclusion

DACs are a versatile tool that can be used to interface the 8085 microprocessor with a variety of analog devices. By understanding how to interface the 8085 with a DAC, students and engineers can develop a wide range of embedded systems applications.

Further Reading:

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