Micro-controller –Atmel AVR ATmega8 28-PDIP’
Crystal frequency—16.000000 MHz
HOW TO COMPILE AND UPLOAD LDMICRO PROGRAM FOR ATMEGA8
Proteus simulation for atmega8
1) Digital input and output
Pin D1 will be high when a digital high is given at pin D0
LADDER DIAGRAM:
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|| Xd0 Yd1 ||
1 ||-------] [--------------( )-------||
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||------[END]-------------------||
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I/O ASSIGNMENT:
| Name | Type | Pin |
|---|---|---|
| Xd0 | digital in | 2 |
| Yd1 | digital out | 3 |
2) Input negated digital switch
Pin B0 in Microcontroller will be high when a digital low is given at pin B6
LADDER DIAGRAM:
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|| Xb0 Yb6 ||
1 ||-------]/[--------------( )-------||
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||------[END]-------------------||
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I/O ASSIGNMENT:
| Name | Type | Pin |
|---|---|---|
| Xb0 | digital in | 27 |
| Yb6 | digital out | 28 |
3) TON TIMER
The pin RB5 will on after one second delay after program starts
LADDER DIAGRAM:
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|| Tnew YRB5 ||
1 ||--[TON 1.000 s]---------( )-------||
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||------[END]-------------------||
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I/O ASSIGNMENT:
| Name | Type | Pin |
|---|---|---|
| YRB5 | digital out | 19 |
| Tnew | turn-on delay |
4) XOR Gate
LADDER DIAGRAM:
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|| XD0 XD1 YB5 ||
1 ||-------] [--------------]/[------+-------( )-------||
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|| XD0 XD1 | ||
||-------]/[--------------] [------+ ||
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||------[END]-------------------------------||
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I/O ASSIGNMENT:
| Name | Type | Pin |
|---|---|---|
| XD0 | digital in | 2 |
| XD1 | digital in | 3 |
| YB5 | digital out | 19 |
5) OR Gate
LADDER DIAGRAM:
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|| XDO YB5 ||
1 ||-------] [------+-------( )-------||
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|| XD1 | ||
||-------] [------+ ||
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||------[END]-------------------||
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I/O ASSIGNMENT:
| Name | Type | Pin |
|---|---|---|
| XD1 | digital in | 3 |
| XDO | digital in | 2 |
| YB5 | digital out | 19 |
6) AND Gate
LADDER DIAGRAM:
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|| XD0 XD1 YPB5 ||
1 ||-------] [--------------] [--------------( )-------||
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||------[END]-------------------------------||
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I/O ASSIGNMENT:
| Name | Type | Pin |
|---|---|---|
| XD0 | digital in | 2 |
| XD1 | digital in | 3 |
| YPB5 | digital out | 19 |
7) ADC with digital output
LADDER DIAGRAM:
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|| A5 ||
1 ||----------------{READ ADC}----||
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|| [A5 <] YD3 ||
2 ||-----[ 500]-------------( )-------||
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|| [A5 >] YD4 ||
3 ||-----[ 499]-------------( )-------||
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||------[END]-------------------||
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I/O ASSIGNMENT:
| Name | Type | Pin |
|---|---|---|
| YD3 | digital out | 5 |
| YD4 | digital out | 6 |
| A5 | adc input | 28 |
8) UART
Send the letter “J” over uart
LADDER DIAGRAM:
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|| {A := } ||
1 ||-{ 'J' MOV}--||
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|| A ||
2 ||---{UART SEND}---||
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||------[END]------||
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9) Sending ADC result over UART
Here i have converted 10-bit ADC result into 8- bit data(ASCII code) by dividing by 4 for proper UART reading
LADDER DIAGRAM:
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|| A5 ||
1 ||----------------{READ ADC}----||
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|| {DIV B :=} ||
2 ||-----------{ A5 / 4 }-----------||
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|| B ||
3 ||---{UART SEND}--- ||
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|| {D := } ||
4 ||----------{ 13 MOV}--||
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|| D ||
5 ||---{UART SEND}--- ||
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||------[END]-------------------||
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I/O ASSIGNMENT:
| Name | Type | Pin |
|---|---|---|
| A5 | adc input | 28 |
| B | UART tx | 3 |
| D | UART tx | 3 |