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CHAPTER 18 8/10-BIT A/D CONVERTER
18.1
Outline of the 8/10-Bit A/D Converter
Using the RC-type successive approximation conversion method, the 8/10-bit A/D
converter converts an analog input voltage into a 10-bit or 8-bit digital value. An input
signal is selected from fifteen channels for analog input pins. The conversion can be
activated by software, 16-bit reload timer 1 output, and external trigger.
■
Functions of the 8/10-bit A/D Converter
The converter converts the analog voltage input to an analog input pin (input voltage) to a digital value.
The converter has the following features:
•
The minimum conversion time is 4.9
μ
s (only possible at certain machine clock frequencies; includes
the sampling time).
•
The minimum sampling time is 1.6
μ
s (only possible at certain machine clock frequencies).
•
The converter uses the RC-type successive approximation conversion method with a sample hold
circuit.
•
A resolution of 10 bits or 8 bits can be selected.
•
Up to 15 channels for analog input pins can be selected by a program.
•
At the end of A/D conversion, an interrupt request can be generated and EI
2
OS can be activated.
•
In the interrupt-enabled state, the conversion data protection function prevents any part of the data from
being lost through continuous conversion.
•
The conversion can be activated by software, 16-bit reload timer 1 (rising edge), and external trigger
ADTG.
•
The MB90390 series has 15 analog inputs, where from either channels 0 to 7 or channels 8 to 14 can be
selected as inputs for the A/D converter.
Table 18.1-1 8/10-bit A/D Converter Conversion Modes
Single conversion
Scan conversion
Single conversion mode
Converts the input of a specified
channel (single channel) just once.
Converts the inputs of two or more consecutive
channels (up to eight channels) just once. Either
channel 0 to channel 7 or channel 8 to channel 14
can be selected.
Continuous conversion
mode
Converts the input of a specified
channel (single channel) repeatedly.
Converts the inputs of two or more consecutive
channels (up to eight channels) repeatedly.Either
channel 0 to channel 7 or channel 8 to channel 14
can be selected.
Stop conversion mode
Converts the input of a specified
channel (single channel), after which
it is on standby for the next activation.
Converts the inputs of two or more consecutive
channels (up to eight channels). Either channel 0 to
channel 7 or channel 8 to channel 14 can be
selected.
When a channel has been converted, the converter is
put on standby for the next activation.
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
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Страница 264: ...236 CHAPTER 14 16 BIT RELOAD TIMER WITH EVENT COUNT FUNCTION ...
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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 ...
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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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