MC68HC08AZ32A Datasheet, PDF (416/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Analog-to-Digital Converter (ADC-15)
23.6.2 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.
23.7 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 423 for voltages
referenced below.
23.7.1 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.
23.7.2 ADC Analog Ground/ADC Voltage Reference Low Pin (A_VSS/V_REFL)
The ADC analog portion uses A_VSS/V_REFL as its ground pin. Connect the
A_VSS/V_REFL pin to the same voltage potential as V_SS.
V_REFL is the lower reference supply for the ADC.
23.7.3 ADC Voltage Reference Pin (V_REFH)
V_REFH is the high reference voltage for all analog-to-digital conversions.
Technical Data
416
MC68HC08AZ32A — Rev 1.0
Analog-to-Digital Converter (ADC-15)
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA