82 READING A SWITCH WITH PORT A AND DRIVING A RELAY FOR 1 MINUTE OBJECTIVE: Read

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82 READING A SWITCH WITH PORT A AND DRIVING A RELAY FOR 1 MINUTE OBJECTIVE: Reading a switch that are connected to port A and use the switched condition from the switch to drive a relay for a time of I minute using a loop. REFERENCE: COMPONENTS:None EQUIPMENT: Notes on the PIC microcontroller Development board INSTRUCTIONS: I. Use the switch on port A, input RA2 and the relay on port RA3. 2. Write a program that would use the switch at RA2 to switch on a relay on port A, RA3. The relay must be on for a duration of 1 minute. You must use a loop to generate the 1 minute time interval. No interrupt may be used to generate the timing loop When you finisbed writing the code using tdhe editor, make sure that the program is saved on your 4. stify with the name: RELAY ASM 5. Show your circuit design for the practical on the given page. QUESTIONS (a) Which registers did you have to initialize for the input and output ports ? (b) Explain the operation of the loop to generate the I minute time delay. (c) Show your calculations to deternine the values that must be used in the loop. (d) Were any flags set in the operation of the program ? What flags were affected ? (e) Show the fBow diagram for the program. (t) Show your program listing with comments. (8) Why can we not use port A, input RA4 to drive the relay

Explanation / Answer

a) regiregi 32 we use

b) reg 36

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