Техника микропроцессорных систем в коммутации. Проектирование микропроцессорных систем на базе микроконтроллеров AVR фирмы Atmel. Горохин В.Н. - 21 стр.

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41
ɦɟɪɚ 0. Ɂɚɩɢɫɶ ɜ ɪɟɝɢɫɬɪ TCNT0 ɛɥɨɤɢɪɭɟɬ ɨɬɪɚɛɨɬɤɭ ɜɨɡɧɢɤɚɸɳɟɝɨ ɫɨɜɩɚɞɟ-
ɧɢɹ ɧɚ ɫɥɟɞɭɸɳɟɦ ɩɨɫɥɟ ɡɚɩɢɫɢ ɬɚɤɬɟ ɫɢɧɯɪɨɧɢɡɚɰɢɢ ɬɚɣɦɟɪɚ. ɂɡɦɟɧɟɧɢɟ ɫɨ-
ɞɟɪɠɢɦɨɝɨ ɫɱɟɬɱɢɤɚ (TCNT0) ɜɨ ɜɪɟɦɹ ɫɱɟɬɚ ɫɜɹɡɚɧɨ ɫ ɪɢɫɤɨɦ ɩɨɬɟɪɢ ɪɟɡɭɥɶ-
ɬɚɬɚ ɫɪɚɜɧɟɧɢɹ ɦɟɠɞɭ TCNT0 ɢ ɪɟɝɢɫɬɪɨɦ OCR0.
Ɍɚɛɥɢɰɚ 16. Ɋɟɝɢɫɬɪ ɬɚɣɦɟɪɚ-ɫɱɟɬɱɢɤɚ – TCNT0
Ɋɚɡɪɹɞ 7 6 5 4 3 2 1 0
TCNT0 TCNT0[7:0]
ɑɬ./ɡɚɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ.
ɂɫɯ. ɡɧɚɱ. 0 0 0 0 0 0 0 0
Ɋɟɝɢɫɬɪ ɩɨɪɨɝɚ ɫɪɚɜɧɟɧɢɹ, ɪɚɡɪɹɞɵ ɤɨɬɨɪɨɝɨ ɩɪɟɞɫɬɚɜɥɟɧɵ ɜ ɬɚɛɥɢɰɟ 17,
ɫɨɞɟɪɠɢɬ 8-ɪɚɡɪ. ɡɧɚɱɟɧɢɟ, ɤɨɬɨɪɨɟ ɧɟɩɪɟɪɵɜɧɨ ɫɪɚɜɧɢɜɚɟɬɫɹ ɰɢɮɪɨɜɵɦ ɤɨɦ-
ɩɚɪɚɬɨɪɨɦ ɫɨ ɡɧɚɱɟɧɢɟɦ 8-ɪɚɡɪ. ɫɱɟɬɱɢɤɚ (TCNT0). Ɏɚɤɬ ɫɨɜɩɚɞɟɧɢɹ ɡɧɚɱɟɧɢɣ
ɦɨɠɟɬ ɢɫɩɨɥɶɡɨɜɚɬɶɫɹ ɞɥɹ ɝɟɧɟɪɚɰɢɢ ɩɪɟɪɵɜɚɧɢɹ ɩɨ ɜɵɩɨɥɧɟɧɢɸ ɭɫɥɨɜɢɹ
ɫɪɚɜɧɟɧɢɹ ɢɥɢ ɞɥɹ ɝɟɧɟɪɚɰɢɢ ɩɪɹɦɨɭɝɨɥɶɧɵɯ ɢɦɩɭɥɶɫɨɜ ɧɚ ɜɵɜɨɞɟ OC0.
Ɍɚɛɥɢɰɚ 17. Ɋɟɝɢɫɬɪ ɩɨɪɨɝɚ ɫɪɚɜɧɟɧɢɹ – OCR0
Ɋɚɡɪɹɞ 7 6 5 4 3 2 1 0
OCR0 OCR0[7:0]
ɑɬ./ɡɚɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ.
ɂɫɯ. ɡɧ. 0 0 0 0 0 0 0 0
Ɍɚɣɦɟɪ/ɫɱɟɬɱɢɤ 1
16-ɬɢ ɪɚɡɪɹɞɧɵɣ ɬɚɣɦɟɪ-ɫɱɟɬɱɢɤ 1 ɩɪɟɞɧɚɡɧɚɱɟɧ ɞɥɹ ɬɨɱɧɨɝɨ ɡɚɞɚɧɢɹ ɜɪɟ-
ɦɟɧɧɵɯ ɢɧɬɟɪɜɚɥɨɜ, ɝɟɧɟɪɚɰɢɢ ɩɪɹɦɨɭɝɨɥɶɧɵɯ ɢɦɩɭɥɶɫɨɜ ɢ ɢɡɦɟɪɟɧɢɹ ɜɪɟɦɟɧ-
ɧɵɯ ɯɚɪɚɤɬɟɪɢɫɬɢɤ ɢɦɩɭɥɶɫɧɵɯ ɫɢɝɧɚɥɨɜ [10].
ɇɚ ɪɢɫɭɧɤɚɯ ɢ ɜ ɬɟɤɫɬɟ ɨɩɢɫɚɧɢɹ ɢɧɞɟɤɫ “n” ɡɚɦɟɧɹɟɬ ɧɨɦɟɪ ɬɚɣɦɟɪɚ-
ɫɱɟɬɱɢɤɚ, ɚ “x” ɡɚɦɟɧɹɟɬ ɧɚɢɦɟɧɨɜɚɧɢɟ ɤɚɧɚɥɚ ɫɪɚɜɧɟɧɢɹ (A, ɢɥɢ B). Ɉɞɧɚɤɨ
ɩɪɢ ɩɪɨɝɪɚɦɦɢɪɨɜɚɧɢɢ ɧɟɨɛɯɨɞɢɦɨ ɢɫɩɨɥɶɡɨɜɚɬɶ ɮɚɤɬɢɱɟɫɤɢɟ ɧɨɦɟɪɚ ɢ ɧɚ-
ɢɦɟɧɨɜɚɧɢɹ.
ȼ ɬɚɛɥɢɰɟ 18 ɩɪɟɞɫɬɚɜɥɟɧɵ ɪɚɡɪɹɞɵ ɪɟɝɢɫɬɪɚ Ⱥ ɭɩɪɚɜɥɟɧɢɹ ɬɚɣɦɟɪɨɦ-
ɫɱɟɬɱɢɤɨɦ 1 – TCCR1A.
ȼ ɬɚɛɥɢɰɟ 19 ɩɪɢɜɟɞɟɧɵ ɪɟɠɢɦɵ ɭɩɪɚɜɥɟɧɢɹ ɫɢɝɧɚɥɨɜ OCnA/OCnB.
ȼ ɬɚɛɥɢɰɟ 20 ɩɪɟɞɫɬɚɜɥɟɧɵ ɪɚɡɪɹɞɵ ɪɟɝɢɫɬɪɚ ȼ ɭɩɪɚɜɥɟɧɢɹ ɬɚɣɦɟɪɨɦ-
ɫɱɟɬɱɢɤɨɦ 1 – TCCR1B.
Ɏɭɧɤɰɢɨɧɚɥɶɧɚɹ ɫɯɟɦɚ 16-ɪɚɡɪ. ɬɚɣɦɟɪɚ-ɫɱɟɬɱɢɤɚ ɩɨɤɚɡɚɧɚ ɧɚ ɪɢɫɭɧɤɟ 20.
42
Ɋɢɫ. 20. Ɏɭɧɤɰɢɨɧɚɥɶɧɚɹ ɫɯɟɦɚ 16-ɪɚɡɪ. ɬɚɣɦɟɪɚ-ɫɱɟɬɱɢɤɚ
Ɍɚɛɥɢɰɚ 18. Ɋɟɝɢɫɬɪ Ⱥ ɭɩɪɚɜɥɟɧɢɹ ɬɚɣɦɟɪɨɦ-ɫɱɟɬɱɢɤɨɦ 1 – TCCR1A
Bit 7 6 5 4 3 2 1 0
COM1
A1
COM1
A0
COM1
B1
COM1
B0
FOC1
A
FOC1
B
WGM11 WGM10
ɑɬ./ɡɚɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ. ɑɬ./Ɂɩ.
ɂɫɯ. ɡɧ. 0 0 0 0 0 0 0 0
Ȼɢɬɵ 7:6 – COM1A1:0 Ɋɟɠɢɦ ɮɨɪɦɢɪɨɜɚɧɢɹ ɜɵɯɨɞɧɨɝɨ ɫɢɝɧɚɥɚ ɤɚɧɚɥɚ A
Ȼɢɬɵ 5:4 – COM1B1:0 Ɋɟɠɢɦ ɮɨɪɦɢɪɨɜɚɧɢɹ ɜɵɯɨɞɧɨɝɨ ɫɢɝɧɚɥɚ ɤɚɧɚɥɚ ȼ
Ɍɚɛɥɢɰɚ 19. ɍɩɪɚɜɥɟɧɢɟ ɪɟɠɢɦɚɦɢ ɫɢɝɧɚɥɨɜ OCnA/OCnB
COMnA1/
COMnB1
COMnA0/
COMnB0
Ɉɩɢɫɚɧɢɟ
0 0 ɇɨɪɦɚɥɶɧɚɹ ɪɚɛɨɬɚ ɩɨɪɬɚ, ɫɢɝɧɚɥɵ OCnA/OCnB ɨɬɤɥɸɱɟɧɵ.
0 1 ɉɟɪɟɤɥɸɱɟɧɢɟ (ɢɧɜɟɪɬɢɪɨɜɚɧɢɟ) OCnA/OCnB ɩɪɢ ɫɨɜɩɚɞɟɧɢɢ.
1 0 ɋɛɪɨɫ OCnA/OCnB ɩɪɢ ɫɨɜɩɚɞɟɧɢɢ (ɭɫɬɚɧɨɜɤɚ ɥɨɝ. 0).
1 1 ɍɫɬɚɧɨɜɤɚ OCnA/OCnB ɩɪɢ ɫɨɜɩɚɞɟɧɢɢ (ɭɫɬɚɧɨɜɤɚ ɥɨɝ. 1).

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