S908AC4MDRE FREESCALE [Freescale Semiconductor, Inc], S908AC4MDRE Datasheet - Page 45
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S908AC4MDRE
Manufacturer Part Number
S908AC4MDRE
Description
M68HC08 Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.S908AC4MDRE.pdf
(274 pages)
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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
port location of these shared pins. The ADC10 on this MCU uses V
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:
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
Freescale Semiconductor
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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
shows a block diagram of the ADC10
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 5
DD
and V
SS
as its supply and reference
Figure 3-1
for
45
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