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Interface ADC 0809 with 8051 Lab Trainer Kit

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This blog post summarize interface ADC 0809 with 8051 using assembly programming

PS-TRAINER-8051 trainer kit is proposed to smooth the progress of learning and developing designs of MCU from Intel and NXP. It has the facility to connect PC’s 101/104 Keyboard, to enter user programs in Assembly languages. Serial communication achieved using 8051. It also supports C & assembly language in standalone kit (P89V51RD2). It’s designed as to facilitate On-board Programmer for NXP 8051 MCU through ISP on serial port.

ADC 0809

The ADC0808, ADC0809 data acquisition component is a Monolithic CMOS device with an 8-bit analog-to-digital converter, 8-channel multiplexer and microprocessor compatible control logic. The 8-bit A/D converter uses successive approximations the conversion technique. The converter features a high

Impedance chopper stabilized comparator, a 256R voltage divider with analog switch tree and a successive approximation register.

Interface ADC 0809 with 8051

8051 microcontroller it doesn’t have an On chip ADC to accept the digital input, it will not accept analog input, so we need a ADC to process the analog signal. For interfacing ADC 0809 we require 8 data lines. So ADC 0809 is an 8 bit ADC has 8 channels works on successive approximation conversion technique

Pin assignment with 8051

Circuit diagram to interface ADC 0809 with 8051

Assembly program to interface ADC 0809 with 8051

8500     74 92     MOV A,#98     
8502     90 40 03     MOV DPTR,#4003     
8505     F0     MOVX @DPTR,A     
8506      90  40 01     MOV DPTR,#4001     
8509 74 01     MOV A,#01     
850B     F0MOVX @DPTR,A     
850C     74 31     MOV A,#31
850E     F0MOVX @DPTR,A     
850F     74 01     MOV A,#01     
8511      F0BACK:     MOVX @DPTR,A
851254 01     ANL A,#01
851430 0A FAJNB  0A,BACK     
8517      74 40     MOV A,#40     
8519     F0     MOVX @DPTR,A     
851A     74 00     MOV A,#00     
851C     F0     MOVX @DPTR,A     
851D     90 40 00     MOV DPTR,#4000     
8520     E0     MOVX A,@DPTR     

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