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參數資料
| 型號： | MC68HC08GP8AMFB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數： | 64/126頁 |
| 文件大?。?/td> | 4243K |
| 代理商： | MC68HC08GP8AMFB |
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Analog-to-Digital Converter (ADC)
Data Sheet
MC68HC08GP8A
42
Analog-to-Digital Converter (ADC)
MOTOROLA
3.3.3 Conversion Time
Conversion starts after a write to the ADSCR. One conversion will take between 16
and 17 ADC clock cycles. The ADIVx and ADICLK bits should be set to provide a
1-MHz ADC clock frequency.
3.3.4 Conversion
In continuous conversion mode, the ADC data register will be filled with new data
after each conversion. Data from the previous conversion will be overwritten
whether that data has been read or not. Conversions will continue until the ADCO
bit is cleared. The COCO bit is set after each conversion and will stay set until the
next read of the ADC data register.
In single conversion mode, conversion begins with a write to the ADSCR. Only one
conversion occurs between writes to the ADSCR. When a conversion is in process
and the ADSCR is written, the current conversion data should be discarded to
prevent an incorrect reading.
3.3.5 Accuracy and Precision
The conversion process is monotonic and has no missing codes.
3.4 Interrupts
When the AIEN bit is set, the ADC module is capable of generating CPU interrupts
after each ADC conversion. A CPU interrupt is generated if the COCO bit is at
logic 0. The COCO bit is not used as a conversion complete flag when interrupts
are enabled.
3.5 Low-Power Modes
The WAIT and STOP instruction can put the MCU in low power-consumption
standby modes.
3.5.1 Wait Mode
The ADC continues normal operation during wait mode. Any enabled CPU interrupt
request from the ADC can bring the MCU out of wait mode. If the ADC is not
required to bring the MCU out of wait mode, power down the ADC by setting
ADCH4–ADCH0 bits in the ADC status and control register before executing the
WAIT instruction.
16 to 17 ADC cycles
ADC frequency
Conversion time =
Number of bus cycles = conversion time
× bus frequency
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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