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MC68HC908AB32 Datasheet, PDF (234/392 Pages) Motorola, Inc – HCMOS Microcontroller Unit
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Analog-to-Digital Converter (ADC)
14.7.1 ADC Analog Power Pin (VDDAREF)
The ADC analog portion uses VDDAREF as its power pin. Connect the
VDDAREF pin to the same voltage potential as VDD. External filtering may
be necessary to ensure clean VDDAREF for good results.
NOTE: For maximum noise immunity, route VDDAREF carefully and place
bypass capacitors as close as possible to the package.
14.7.2 ADC Analog Ground Pin (AVSS/VREFL)
The ADC analog portion uses AVSS/VREFL as its ground pin. Connect the
AVSS/VREFL pin to the same voltage potential as VSS.
NOTE: Route AVSS/VREFL cleanly to avoid any offset errors.
14.7.3 ADC Voltage Reference High Pin (VREFH)
VREFH is the reference voltage for the ADC.
14.7.4 ADC Voltage In (VADIN)
VADIN is the input voltage signal from one of the eight ADC channels to
the ADC module.
14.8 I/O Registers
These I/O registers control and monitor ADC operation:
• ADC status and control register (ADSCR)
• ADC data register (ADR)
• ADC clock register (ADCLK)
Technical Data
234
Analog-to-Digital Converter (ADC)
MC68HC908AB32 — Rev. 1.1
Freescale Semiconductor
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