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MC908QY2ACPE Datasheet(PDF) 37 Page - Freescale Semiconductor, Inc

No. de Pieza. MC908QY2ACPE
Descripción  M68HC08 Microcontrollers
Descarga  200 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC908QY2ACPE Datasheet(HTML) 37 Page - Freescale Semiconductor, Inc

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MC68HC908QYA/QTA Family Data Sheet, Rev. 3
Freescale Semiconductor
37
Chapter 3
Analog-to-Digital Converter (ADC10) Module
3.1 Introduction
This section describes the 10-bit successive approximation analog-to-digital converter (ADC10).
The ADC10 module shares its pins with general-purpose input/output (I/O) port pins. See Figure 3-1 for
port location of these shared pins. The ADC10 on this MCU uses VDD and VSS as its supply and reference
pins. This MCU uses BUSCLKX4 as its alternate clock source for the ADC. This MCU does not have a
hardware conversion trigger.
3.2 Features
Features of the ADC10 module include:
Linear successive approximation algorithm with 10-bit resolution
Output formatted in 10- or 8-bit right-justified format
Single or continuous conversion (automatic power-down in single conversion mode)
Configurable sample time and conversion speed (to save power)
Conversion complete flag and interrupt
Input clock selectable from up to three sources
Operation in wait and stop modes for lower noise operation
Selectable asynchronous hardware conversion trigger
3.3 Functional Description
The ADC10 uses successive approximation to convert the input sample taken from ADVIN to a digital
representation. The approximation is taken and then rounded to the nearest 10- or 8-bit value to provide
greater accuracy and to provide a more robust mechanism for achieving the ideal code-transition voltage.
Figure 3-2 shows a block diagram of the ADC10
For proper conversion, the voltage on ADVIN must fall between VREFH and VREFL. If ADVIN is equal to
or exceeds VREFH, the converter circuit converts the signal to $3FF for a 10-bit representation or $FF for
a 8-bit representation. If ADVIN is equal to or less than VREFL, the converter circuit converts it to $000.
Input voltages between VREFH and VREFL are straight-line linear conversions.
NOTE
Input voltage must not exceed the analog supply voltages.


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