MC68HC908JG16 Datasheet, PDF (250/324 Pages) Motorola, Inc – Microcontrollers

Analog-to-Digital Converter (ADC)
13.6.2 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.
13.7 I/O Signals
The ADC module has eight channels that are shared with port A I/O pins,
PTA7/KBA7/AD7–PTA0/KBA0/AD0.
13.7.1 ADC Analog Power Pin (V_DDA)
NOTE:
The ADC analog portion uses V_DDA as its power pin. Connect the V_DDA
pin to the same voltage potential as V_DD. External filtering may be
necessary to ensure clean V_DDA for good results.
Route V_DDA carefully for maximum noise immunity and place bypass
capacitors as close as possible to the package.
13.7.2 ADC Analog Ground Pin (V_SSA)
The ADC analog portion uses V_SSA as its ground pin. Connect the V_SSA
pin to the same voltage potential as V_SS.
13.7.3 ADC Voltage Reference High Pin (V_REFH)
V_REFH is the high voltage reference for the ADC.
13.7.4 ADC Voltage Reference Low Pin (V_REFL)
V_REFL is the low voltage reference for the ADC.
13.7.5 ADC Voltage In (ADCVIN)
ADCVIN is the input voltage signal from one of the eight ADC channels
to the ADC module.
Technical Data
250
Analog-to-Digital Converter (ADC)
MC68HC908JG16 — Rev. 1.1
Freescale Semiconductor