MC68HC08AZ60A Datasheet, PDF (438/480 Pages) Motorola, Inc – Microcontrollers

Analog-to-Digital Converter (ADC-15)
24.6.2 Stop Mode
The ADC module is inactive after the execution of a STOP instruction.
Any pending conversion is aborted. ADC conversions resume when the
MCU exits stop mode. Allow one conversion cycle to stabilize the analog
circuitry before attempting a new ADC conversion after exiting stop
mode.
24.7 I/O Signals
The ADC module has 15 channels that are shared with I/O ports B and
D. Refer to Electrical Specifications on page 445 for voltages
referenced below.
24.7.1 ADC Analog Power Pin (V_DDAREF)
The ADC analog portion uses V_DDAREF as its power pin. Connect the
V_DDAREF pin to the same voltage potential as V_DD. External filtering may
be necessary to ensure clean V_DDAREF for good results.
NOTE:
Route V_DDAREF carefully for maximum noise immunity and place bypass
capacitors as close as possible to the package. V_DDAREF must be
present for operation of the ADC.
24.7.2 ADC Analog Ground/ADC Voltage Reference Low Pin (A_VSS/VREFL)
The ADC analog portion uses A_VSS/VREFL as its ground pin. Connect
the A_VSS/VREFL pin to the same voltage potential as V_SS.
V_REFL is the lower reference supply for the ADC.
24.7.3 ADC Voltage Reference Pin (V_REFH)
V_REFH is the high reference voltage for all analog-to-digital conversions.
Advance Information
438
Analog-to-Digital Converter (ADC-15)
MC68HC08AZ60A — Rev 0.0
MOTOROLA