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參數(shù)資料
| 型號(hào)： | MC68HC08GP8ACFB |
| 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(shù)： | 60/126頁 |
| 文件大?。?/td> | 4243K |
| 代理商： | MC68HC08GP8ACFB |
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MC68HC08GP8A
Data Sheet
MOTOROLA
Analog-to-Digital Converter (ADC)
39
Data Sheet — MC68HC08GP8A
Section 3. Analog-to-Digital Converter (ADC)
3.1 Introduction
This section describes the 8-bit analog-to-digital converter (ADC).
3.2 Features
Features of the ADC module include:
Eight channels with multiplexed input
Linear successive approximation with monotonicity
8-bit resolution
Single or continuous conversion
Conversion complete flag or conversion complete interrupt
Selectable ADC clock
3.3 Functional Description
The ADC provides eight pins for sampling external sources at pins
PTB7/AD7–PTB0/AD0. An analog multiplexer allows the single ADC converter to
select one of eight ADC channels as ADC voltage in (VADIN). VADIN is converted
by the successive approximation register-based analog-to-digital converter. When
the conversion is completed, ADC places the result in the ADC data register and
sets a flag or generates an interrupt. See Figure 3-2.
3.3.1 ADC Port I/O Pins
PTB7/AD7–PTB0/AD0 are general-purpose I/O (input/output) pins that share with
the ADC channels. The channel select bits define which ADC channel/port pin will
be used as the input signal. The ADC overrides the port I/O logic by forcing that pin
as input to the ADC. The remaining ADC channels/port pins are controlled by the
port I/O logic and can be used as general-purpose I/O. Writes to the port register
or DDR will not have any affect on the port pin that is selected by the ADC. Read
of a port pin in use by the ADC will return a logic 0.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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