Техника микропроцессорных систем в коммутации. Проектирование микропроцессорных систем на базе микроконтроллеров AVR фирмы Atmel. Горохин В.Н. - 35 стр.

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Ȼɢɬɵ 4..0 - MUX4..MUX0 – ɩɪɟɞɧɚɡɧɚɱɟɧɵ ɞɥɹ ɜɵɛɨɪɚ ɜɯɨɞɚ, ɤɨɦɦɭɬɢ-
ɪɭɟɦɨɝɨ ɧɚ ɜɯɨɞ ɩɪɟɨɛɪɚɡɨɜɚɬɟɥɹ. ȼɵɛɨɪ ɨɫɭɳɟɫɬɜɥɹɟɬɫɹ ɜ ɫɨɨɬɜɟɬɫɬɜɢɢ ɫ ɬɚɛ-
ɥɢɰɟɣ 29. ɂɡɦɟɧɟɧɢɟ ɷɬɢɯ ɛɢɬɨɜ ɜ ɩɪɨɰɟɫɫɟ ɩɪɟɨɛɪɚɡɨɜɚɧɢɹ, ɤɨɝɞɚ ɮɥɚɝ ADIF ɜ
ɪɟɝɢɫɬɪɟ ADCSR ɭɫɬɚɧɨɜɥɟɧ, ɧɟ ɩɪɢɜɨɞɢɬ ɤ ɢɡɦɟɧɟɧɢɸ ɪɟɡɭɥɶɬɚɬɚ.
Ɍɚɛɥɢɰɚ 29. ȼɵɛɨɪ ɜɯɨɞɧɨɝɨ ɫɢɝɧɚɥɚ ADC
MUX4..0 ɉɨɞɤɥɸɱɚɟɦɵɣ ɤɨɧɬɚɤɬ
00000 ADC0
00001 ADC1
00010 ADC2
00011 ADC3
00100 ADC4
00101 ADC5
00110 ADC6
00111 ADC7
01000. .11101 Ɋɟɡɟ
ɪ
ɜ
11110 1.22V
11111 0V (AGND)
Ɋɟɝɢɫɬɪ – ADCSR ɩɪɟɞɧɚɡɧɚɱɟɧ ɞɥɹ ɭɩɪɚɜɥɟɧɢɹ ɪɚɛɨɬɨɣ ɚɧɚɥɨɝɨ-
ɰɢɮɪɨɜɨɝɨ ɩɪɟɨɛɪɚɡɨɜɚɬɟɥɹ.
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Ȼɢɬ 7 – ADEN – ɪɚɡɪɟɲɟɧɢɟ ɪɚɛɨɬɵ ADC.
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Ȼɢɬ 6 – ADSC – ɡɚɩɭɫɤ ɩɪɟɨɛɪɚɡɨɜɚɧɢɹ ADC.
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Ȼɢɬ 5 – ADFR – ɭɫɬɚɧɨɜɤɚ ɰɢɤɥɢɱɟɫɤɨɝɨ ɪɟɠɢɦɚ ɪɚɛɨɬɵ ADC.
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Ȼɢɬ 4 – ADIF – ɮɥɚɝ ɩɪɟɪɵɜɚɧɢɹ ADC.
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Ȼɢɬ 3 – ADIE – ɪɚɡɪɟɲɟɧɢɟ ɩɪɟɪɵɜɚɧɢɹ ADC.
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Ȼɢɬɵ 2..0 – ADPS2..ADPS0 – ɜɵɛɨɪ ɤɨɷɮɮɢɰɢɟɧɬɚ ɩɪɟɞɜɚɪɢɬɟɥɶɧɨɝɨ ɞɟ-
ɥɟɧɢɹ (ɬɚɛɥ. 30).
Ɍɚɛɥɢɰɚ 30. ȼɵɛɨɪ ɤɨɷɮɮɢɰɢɟɧɬɚ ɩɪɟɞɜɚɪɢɬɟɥɶɧɨɝɨ ɞɟɥɟɧɢɹ
ADPS2 ADPS1 ADPS0 Ʉɨɷ
ɮɮ
ɢɰɢɟɧɬ ɞɟɥɟɧɢɹ
0 0 0 Ȼɟɡ
ɞ
ɟɥɟɧɢɹ
0 0 1 2
0 1 0 4
0 1 1 8
1 0 0 16
1 0 1 32
1 1 0 64
1 1 1 128
Ɋɟɝɢɫɬɪɵ ADCL ɢ ADCH ɹɜɥɹɸɬɫɹ ɪɟɝɢɫɬɪɚɦɢ ɞɚɧɧɵɯ.
ȿɫɥɢ ADLAR ɫɛɪɨɲɟɧ, ɬɨ ɪɟɡɭɥɶɬɚɬ ɩɪɟɞɫɬɚɜɥɟɧ ɜ ɜɢɞɟ, ɢɡɨɛɪɚɠɟɧɧɨɦ ɧɚ
ɪɢɫ. 26.
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Ɋɢɫ. 26. ɉɪɟɞɫɬɚɜɥɟɧɢɟ ɪɟɡɭɥɶɬɚɬɚ ɜ ɪɟɝɢɫɬɪɟ ɞɚɧɧɵɯ ɩɪɢ ADLAR=0
ȿɫɥɢ ɞɨɫɬɚɬɨɱɧɵɦ ɹɜɥɹɟɬɫɹ 8-ɛɢɬɧɨɟ ɩɪɟɨɛɪɚɡɨɜɚɧɢɟ, ɬɨ ɩɪɢ ADLAR=0
ɦɨɠɧɨ ɫɱɢɬɵɜɚɬɶ ɬɨɥɶɤɨ ɫɬɚɪɲɢɣ ɛɚɣɬ ɪɟɡɭɥɶɬɚɬɚ (ɪɟɝɢɫɬɪ ADCH).
Ɂɚɞɚɧɢɟ ɤ ɥɚɛɨɪɚɬɨɪɧɨɣ ɪɚɛɨɬɟ
ɂɡɭɱɢɬɶ ɩɪɨɝɪɚɦɦɭ Lb6.asm ɢ ɮɚɣɥ ɩɪɨɟɤɬɚ Lb_6.prj. Ɉɬɥɚɞɢɬɶ ɩɪɨɝɪɚɦɦɭ
ɜ ɫɪɟɞɟ VMLab, ɩɨɞɤɥɸɱɢɜ ɧɟɨɛɯɨɞɢɦɭɸ ɩɟɪɢɮɟɪɢɸ ɤ ɦɢɤɪɨɤɨɧɬɪɨɥɥɟɪɭ
AVR – ɢɫɬɨɱɧɢɤ ɫɢɧɭɫɨɢɞɚɥɶɧɨɝɨ ɧɚɩɪɹɠɟɧɢɹ. ɉɪɨɝɪɚɦɦɚ ɩɪɟɨɛɪɚɡɭɟɬ ɧɚɩɪɹ-
ɠɟɧɢɟ ɧɚ ɜɵɜɨɞɟ PA5 ɦɢɤɪɨɤɨɧɬɪɨɥɥɟɪɚ ɜ ɞɜɨɢɱɧɵɣ 10-ɪɚɡɪɹɞɧɵɣ ɤɨɞ. ɂɫ-
ɩɨɥɶɡɭɟɬɫɹ 8 ɫɬɚɪɲɢɯ ɪɚɡɪɹɞɨɜ. ɉɪɟɨɛɪɚɡɨɜɚɧɢɟ ɨɫɭɳɟɫɬɜɥɹɟɬɫɹ ɩɨ ɩɪɟɪɵɜɚɧɢ-
ɹɦ ɨɬ ADC. ɇɚ ɪɢɫ. 27 ɩɪɟɞɫɬɚɜɥɟɧɵ ɪɟɡɭɥɶɬɚɬɵ ɦɨɞɟɥɢɪɨɜɚɧɢɹ ɩɪɨɝɪɚɦɦɵ
ɭɩɪɚɜɥɟɧɢɹ ɚɧɚɥɨɝɨ-ɰɢɮɪɨɜɵɦ ɩɪɟɨɛɪɚɡɨɜɚɬɟɥɟɦ ɩɨ ɩɪɟɪɵɜɚɧɢɹɦ.
Ɋɢɫ. 27. Ɋɟɡɭɥɶɬɚɬɵ ɦɨɞɟɥɢɪɨɜɚɧɢɹ ɩɪɨɝɪɚɦɦɵ
ɭɩɪɚɜɥɟɧɢɹ ɚɧɚɥɨɝɨ-ɰɢɮɪɨɜɵɦ ɩɪɟɨɛɪɚɡɨɜɚɬɟɥɟɦ

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