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CHAPTER 18 8/10-BIT A/D CONVERTER
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A/D control status register (ADCS0, ADCS1)
This register selects activation by software or another activation trigger, the conversion mode, and the A/D
conversion channel. It also enables or disables interrupt requests, checks the interrupt request status, and
indicates whether the conversion has halted or is in progress.
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A/D data register (ADCR0, ADCR1)
This register holds the result of A/D conversion and selects the resolution for A/D conversion.
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Clock selector
The clock selector selects the clock for activating A/D conversion. Either 16-bit reload timer channel 1
output or external trigger (ADTG) can be used as the activation clock.
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Decoder
This circuit selects the analog input pin to be used based on the settings of the ANE0 to ANE2 bits and
ANS0 to ANS2 bits of the A/D control status register (ADCS0).
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Analog channel selector
This circuit selects the pin to be used from fifteen analog input pins.
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Sample hold circuit
This circuit maintains the input voltage of the channel selected by the analog channel selector. It samples
and maintains the input voltage obtained immediately after the activation of A/D conversion. This circuit
protects the A/D conversion from any variations in the input voltage during approximation.
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D/A converter
This circuit generates a reference voltage for comparison with the input voltage maintained by the sample
hold circuit.
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Comparator
This circuit compares the input voltage maintained by the sample hold circuit with the output voltage of the
D/A converter to determine which is greater.
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Control circuit
This circuit determines the A/D conversion value based on the decision signal generated by the comparator.
When the A/D conversion has been completed, the circuit sets the conversion result in the A/D data register
(ADCR0, ADCR1) and generates an interrupt request.
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
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Страница 132: ...104 CHAPTER 5 CLOCKS ...
Страница 152: ...124 CHAPTER 6 CLOCK MODULATOR ...
Страница 210: ...182 CHAPTER 11 TIME BASE TIMER ...
Страница 218: ...190 CHAPTER 12 WATCHDOG TIMER ...
Страница 264: ...236 CHAPTER 14 16 BIT RELOAD TIMER WITH EVENT COUNT FUNCTION ...
Страница 274: ...246 CHAPTER 15 WATCH TIMER ...
Страница 306: ...278 CHAPTER 17 DTP EXTERNAL INTERRUPTS ...
Страница 338: ...310 CHAPTER 18 8 10 BIT A D CONVERTER ...
Страница 364: ...336 CHAPTER 19 UART0 UART1 ...
Страница 398: ...370 CHAPTER 20 UART2 UART3 Figure 20 5 2 ORE Set Timing Receive data RDRF ORE ...
Страница 432: ...404 CHAPTER 20 UART2 UART3 ...
Страница 482: ...454 CHAPTER 22 SERIAL I O ...
Страница 560: ...532 CHAPTER 24 STEPPING MOTOR CONTROLLER ...
Страница 582: ...554 CHAPTER 27 ROM MIRRORING MODULE ...
Страница 632: ...604 CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION ...
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Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
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