MC68HC908KX8 Datasheet, PDF (250/310 Pages) Motorola, Inc – Microcontrollers

Analog-to-Digital Converter (ADC)
17.7 I/O Signals
The ADC module has four channels that are shared with port B pins.
Refer to 20.10 Trimmed Accuracy of the Internal Clock Generator for
voltages referenced here.
17.7.1 ADC Analog Power and ADC Voltage Reference Pins
The ADC analog portion uses V_DD as its power pin and V_SS as its ground
pin.
Due to pin limitations, the V_REFL signal is internally connected to V_SS on
the MC68HC908KX8. On the MC68HC908KX8, the V_REFH signal is
internally connected to V_DD.
17.7.2 ADC Voltage In (ADCVIN)
ADCVIN is the input voltage signal from one of the four ADC channels to
the ADC module.
17.8 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, ADICLK
Technical Data
250
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
Analog-to-Digital Converter (ADC)
MOTOROLA