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CHAPTER 20 8/10-BIT A/D CONVERTER
20.7
Usage Notes on the 8/10-bit A/D Converter
Notes on using the 8/10-bit A/D converter.
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Usage Notes on the 8/10-bit A/D Converter
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Analog input pin
The A/D input pins are also used as the I/O pins of port 5. The port 5 data register (DDR5) and analog
input enable register (ADER) determine which pin is used for which purpose.
To use a pin as analog input, write "0" to the corresponding bit of DDR5 and change the port setting to
input. Then, set the analog input mode (ADEx = 1) in the ADER register and determine the input gate of
the port.
If an intermediate-level signal is input in the port input mode (ADEx = 0), a leakage current flows through
the gate.
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Note on using an internal timer
To start the A/D converter with an internal timer, set the STS1 and STS0 bits of A/D control status register
1 (ADCS1) accordingly. Set the input value of the internal timer at the inactive level (L for the internal
timer). Otherwise, operation may start concurrently with writing to the ADCS register.
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Sequence of turning on the A/D converter and analog input
Do not turn on power to the A/D converter (AVcc, AVR) and to the analog inputs (AN0 to AN7) before the
digital power supply (Vcc) has been turned on.
Do not turn off the digital power supply (Vcc) before power to the A/D converter and the analog inputs has
been turned off.
●
Supply voltage to the A/D converter
The supply voltage to the A/D converter (AVcc) must not exceed the digital power supply (Vcc);
otherwise, latch-up may occur.
Содержание MB90460 Series
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Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Страница 715: ...696 APPENDIX ...
Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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