Microprocessor & Interfacing Lab Experiments

To generate Triangular waveform using 8085 Microprocessor.

Sep 24 2023

Aim

Code for display the message “Program for triangular wave generation”

DYNA85LU> E C050 [Press Enter]

C080 0D 0A 50 52 4F 47 52 41 4D 20 46 4F 52 20 44 41

C090 43 0D 0A 54 52 49 41 4E 47 55 4C 41 52 20 57 41

C0A0 56 45 20 47 45 4E 45 52 41 54 4F 52 00

[Press Enter]

Procudure:There is a 26 pin connector J3. All the lines of 8255 PIO are brought out on this connector.

The PIO cards are interfaced through 26 pin FRC flat cable.

Connect the PIO card to DYNA -85L (J3) through 26 pin FRC flat cable as shown below:

The program for all the PIO cards are given in an EPROM (2732) labeled PIO-MON. Place EPROM in socket U3 of DYNA_85L kit. Do the appropriate jumper setting for 2732 EPROM (Check DYNA-85L Manual for details).

The Program can be entered in two ways:

Copy the program from the specified RAM location as: DYNA-85> C 4E00 4EFF C000 Enter

Enter the program given as below:

Run the program from C020.

Program:DYNA85LU> A C020 [Press Enter]

Address	Opcode	Label	Mnemonics	Remark
C020	21 80 C0		LXI H, C080	Load Message in HL
C023	CD 44 18		CALL 1844	Call display subroutine
C026	3E 89		MVI A,89h	8255 mode set
C028	D3 13		Out 13	Mode 0
C02A	3E 01		MVI A,00	Initialize A by 0
C02C	D3 11		OUT 11	Move the value to 8255
C02E	3E 00		MVI A, 00	Clear ACC.
C030	3C	Up:	INR A	Increment step counter Up to FF
C031	D3 10		Out 10	Increment step counter Up to FF
C033	FE FF		CPI FF	Increment step counter Up to FF
C035	C2 30 C0		JNZ Up	Increment step counter Up to FF
C038	3D	Next:	DCR A	Decrement Step Counter
C039	D3 10		OUT 10	From FFH to 00H
C03B	FE 00		CPI 00	From FFH to 00H
C03D	C2 38 C0		JNZ Next	From FFH to 00H
C040	C3 30 C0		JMP Up	Do again
C043			RST1	Hold the program
				Press Enter Key
				DYNA85LU> G C000 [Press Enter Key]

Waveform

Calculation:- One Wave Cycle-

Amplitude:

Time Period:

Result:The Triangular Waveform was generated and viewed in the CRO as:

Viva Questions:

What are the internal devices of 8255?
What is a programmable peripheral device?
What are the information that can be obtained from the status word of 8255?
What is stepper motor?
What are the different modes of operation of stepper motor?

8086 Based ProgramsSteps to Insert and Execute a program in M86-02 Dynalog Trainer kit

There are three major types of data transfer between the microcomputer and art I/O device. They are,

Steps:

Power on the trainer
A message display on the display “[ M86-02]”
Now first press “Reset” button then “enter” key.
The menu display “> A. D. F. G. I. M. P. T. U.”
This kit is working in two modes “ASSEMBLE MODE AND DESSEMBLE MODE” for assemble mode press “A” then starting add. Of the program then “ENTER” starting address of your program, by default Ram starting address start from “0400H”.
Now enter UP TO END of the program. Your program and press “ENTER” and the memory location automatically increment.
To now to execute program examine result observe the memory locations where data is manipulated. Press “D” address out data location and press “enter” data is displayed.
If we want to write the program through opcode
Just enter “D”then starting address of program and after that press “ENTER” key from keyboard up to end address of the programmed and also give the input data add. of the program.
A Press “GO” from keyboard then starting add. Of the program is 400 then enter key.
Now to execute program examine result observe the memory locations where data is manipulated. Press “D” address out data location and press “enter” data is displayed.