s908gz60cfa Freescale Semiconductor, Inc, s908gz60cfa Datasheet - Page 67

• Manufacturer Part Number: s908gz60cfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

3.7.3 ADC Voltage Reference High Pin (V
The ADC analog portion uses V
pin to the same voltage potential as V
good results. Any noise present on this pin will be reflected and possibly magnified in A/D conversion
values.
V
3.7.4 ADC Voltage Reference Low Pin (V
The ADC analog portion uses V
to the same voltage potential as V
results. Any noise present on this pin will be reflected and possibly magnified in A/D conversion values.
V
3.7.5 ADC Voltage In (V
V
3.8 I/O Registers
These I/O registers control and monitor ADC operation:
Freescale Semiconductor
DDAD
SSAD
ADIN
•
•
•
is the input voltage signal from one of the 24 ADC channels to the ADC module.
ADC status and control register (ADSCR)
ADC data register (ADRH and ADRL)
ADC clock register (ADCLK)
and V
and V
REFL
REFH
For maximum noise immunity, route V
capacitors as close as possible to the package. Routing V
parallel to V
For maximum noise immunity, route V
to V
Routing V
noise rejection.
are bonded internally.
are bonded internally.
SS
MC68HC908GZ60 • MC68HC908GZ48 • MC68HC908GZ32 Data Sheet, Rev. 6
, place bypass capacitors as close as possible to the package.
REFH
REFL
ADIN
close and parallel to V
REFL
REFH
may improve common mode noise rejection.
)
SS
. External filtering is often necessary to ensure a clean V
as its lower voltage reference pin. By default, connect the V
DD
as its upper voltage reference pin. By default, connect the V
. External filtering is often necessary to ensure a clean V
REFL
REFH
NOTE
NOTE
REFL
REFH
)
REFL
)
may improve common mode
carefully and, if not connected
carefully and place bypass
REFH
close and
REFL
I/O Registers
REFH
REFL
for good
REFH
pin
for
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