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83C51FA与83c51FB的可编程计数器阵列PCA的功能
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大小:586 |
2009-06-24
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This application note illustrates the different functions of the Programmable Counter Array (PCA) which are available on the 83C51FA and 83C51FB. Included are
cookbook samples of code in typical applications to simplify the use of the PCA. Since all the examples are written in assembly language, it is assumed the reader is
familiar with ASM51. For further information on these products or ASM51 refer to the Embedded Controller Handbook (Vol. I).
CONTENTS PAGE
PCA OVERVIEW 1
PCA TIMER/COUNTER 1
COMPARE/CAPTURE MODULES 3
CAPTURE MODE 5
Measuring Pulse Widths 5
Measuring Periods 7
Measuring Frequencies 7
Measuring Duty Cycles 9
Measuring Phase Differences 10
Reading the PCA Timer 13
COMPARE MODE 13
SOFTWARE TIMER 13
HIGH SPEED OUTPUT 15
WATCHDOG TIMER 18
PULSE WIDTH MODULATOR 19
CONCLUSION 21
APPENDICES
A. Test Routines A-1
B. Duty Cycle Calculation B-1
C. Special Function Registers C-1
FIGURES PAGE
1. PCA Timer/Counter and Compare/
Capture Modules 1
2. PCA Interrupt 4
3. PCA Capture Mode 5
4. Measuring Pulse Width 5
5. Measuring Period 7
6. Measuring Frequency 7
7. Measuring Duty Cycle 9
8. Measuring Phase Differences 10
9. Software Timer Mode 13
10. High Speed Output Mode 15
11. Watchdog Timer Mode 18
12. PWM Mode 19
13. CCAPnH Varies Duty Cycle 20
LISTINGS PAGE
1. Measuring Pulse Widths 6
2. Measuring Frequencies 8
3. Measuring Duty Cycle 9
4. Measuring Phase Differences 11
5. Software Timer 14
6. High Speed Output (Without
Interrupt) 15
7. High Speed Output (With Interrupt) 16
8. High Speed Output (Single Pulse) 17
9. Watchdog Timer 19
10. PWM 21
TABLES PAGE
1. PCA Timer/Counter Inputs 2
2. CMOD Values 2
3. Compare/Capture Mode Values 3
4. PWM Frequencies 20
cookbook samples of code in typical applications to simplify the use of the PCA. Since all the examples are written in assembly language, it is assumed the reader is
familiar with ASM51. For further information on these products or ASM51 refer to the Embedded Controller Handbook (Vol. I).
CONTENTS PAGE
PCA OVERVIEW 1
PCA TIMER/COUNTER 1
COMPARE/CAPTURE MODULES 3
CAPTURE MODE 5
Measuring Pulse Widths 5
Measuring Periods 7
Measuring Frequencies 7
Measuring Duty Cycles 9
Measuring Phase Differences 10
Reading the PCA Timer 13
COMPARE MODE 13
SOFTWARE TIMER 13
HIGH SPEED OUTPUT 15
WATCHDOG TIMER 18
PULSE WIDTH MODULATOR 19
CONCLUSION 21
APPENDICES
A. Test Routines A-1
B. Duty Cycle Calculation B-1
C. Special Function Registers C-1
FIGURES PAGE
1. PCA Timer/Counter and Compare/
Capture Modules 1
2. PCA Interrupt 4
3. PCA Capture Mode 5
4. Measuring Pulse Width 5
5. Measuring Period 7
6. Measuring Frequency 7
7. Measuring Duty Cycle 9
8. Measuring Phase Differences 10
9. Software Timer Mode 13
10. High Speed Output Mode 15
11. Watchdog Timer Mode 18
12. PWM Mode 19
13. CCAPnH Varies Duty Cycle 20
LISTINGS PAGE
1. Measuring Pulse Widths 6
2. Measuring Frequencies 8
3. Measuring Duty Cycle 9
4. Measuring Phase Differences 11
5. Software Timer 14
6. High Speed Output (Without
Interrupt) 15
7. High Speed Output (With Interrupt) 16
8. High Speed Output (Single Pulse) 17
9. Watchdog Timer 19
10. PWM 21
TABLES PAGE
1. PCA Timer/Counter Inputs 2
2. CMOD Values 2
3. Compare/Capture Mode Values 3
4. PWM Frequencies 20
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