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8085TRAINER KIT

PS-TRAINER-8085 microprocessor trainer kit is proposed to smooth the progress of learning and developing designs of microprocessor from Intel. It has the Facility to connect PC’s 101/104 Keyboard, to enter user programs in Assembly languages. User verifies the programs through LCD or PC. User friendly Firmware confirms facilitating the beginners learns operations of a microprocessor quickly.

LED (LIGHT EMITTING DIODES)

Light Emitting Diodes (LED) is the most commonly used components, usually for displaying pins digital states. Typical uses of LEDs include alarm devices, timers and confirmation of user input such as a mouse click or keystroke.

INTERFACING LED

Fig. 1 shows how to interface the LED to microprocessor. As you can see the Anode is connected through a resistor to GND & the Cathode is connected to the Microprocessor pin. So when the Port Pin is HIGH the LED is OFF & when the Port Pin is LOW the LED is turned ON.



 Interfacing LED to Microprocessor

Fig. 1 Interfacing LED to Microprocessor

 

INTERFACING LED WITH 8085

We now want to flash a LED in 8085 Trainer Board. It works by turning ON a LED & then turning it OFF & then looping back to START. However the operating speed of microprocessor is very high.

 

PIN ASSIGNMENT WITH 8085



 

Point LEDs

8255 Lines

LED Selection

DIGITAL OUTPUTS

LED1

PA.0

LED Selection  

 

 

LED2

PA.1

LED3

PA.2

LED4

PA.3

LED5

PA.4

LED6

PA.5

LED7

PA.6

LED8

PA.7

 



CIRCUIT DIAGRAM TO INTERFACE LED WITH 8255



CIRCUIT DIAGRAM TO INTERFACE LED WITH 8255

ASSEMBLY PROGRAM TO ON AND OFF LED USING 8085

CNTRL : 0X23H PORT B : 0X21H

ADDRESS     

OPCODE   

MNEMONICS     

8500     

3E 80            

MVI A, 80H     

8502     

D3 0F            

OUT CNTRL     

8504     

      

START:

8504     

3E 00            

MVI A, 00H     

8506     

D3 0D     

OUT PORTB     

8508     

CD 15 85     

CALL DELAY     

850B     

3E FF     

MVI A, FFH     

850D     

D3 0D     

OUT PORTB     

850F     

CD 15 85      

CALL DELAY     

8512     

C3 04 85      

JMP START     

8515     

 

DELAY:     

8515     

06 05            

MVI B, 05     

8517     

0E FF     

L1: MVI C, FFH     

8519     

0D      

L2: DCR C     

851A     

C2 19 85      

JNZ L2     

851D     

05      

DCR B     

8520     

C2 17 85      

JNZ L1     

8521     

C9      

RET