s908ey16g2vfar Freescale Semiconductor, Inc, s908ey16g2vfar Datasheet - Page 47

• Manufacturer Part Number: s908ey16g2vfar
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

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
V
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
For proper conversion, the voltage on ADVIN must fall between V
or exceeds V
a 8-bit representation. If ADVIN is equal to or less than V
Input voltages between V
Freescale Semiconductor
REFH
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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
and V
shows a block diagram of the ADC10.
REFL
REFH
, the converter circuit converts the signal to $3FF for a 10-bit representation or $FF for
as its reference pins. This MCU uses CGMXCLK as its alternate clock source for the
Input voltage must not exceed the analog supply voltages.
REFH
MC68HC908EY16A • MC68HC908EY8A Data Sheet, Rev. 1
and V
REFL
are straight-line linear conversions.
NOTE
REFL
, the converter circuit converts it to $000.
REFH
DDA
and V
and V
REFL
SSA
. If ADVIN is equal to
as its supply pins and
Figure 3-1
for
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