Interface ADC 0809 with 8051 Lab Trainer Kit

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

MEMORY ADDRESS	OPCODE	MNEMONICS
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	F0	MOVX @DPTR,A
850C	74 31	MOV A,#31
850E	F0	MOVX @DPTR,A
850F	74 01	MOV A,#01
8511	F0	BACK:     MOVX @DPTR,A
8512	54 01	ANL A,#01
8514	30 0A FA	JNB  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