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MC9RS08KA8RM Datasheet, PDF (98/190 Pages) Freescale Semiconductor, Inc – MC9RS08KA8 Features
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Analog-to-Digital Converter (RS08ADC10V1)
10.2.1 Analog Power (VDDAD)
The ADC analog portion uses VDDAD as its power connection. In some packages, VDDAD is connected
internally to VDD. If externally available, connect the VDDAD pin to the same voltage potential as VDD.
External filtering might be necessary to ensure clean VDDAD for good results.
10.2.2 Analog Ground (VSSAD)
The ADC analog portion uses VSSAD as its ground connection. In some packages, VSSAD is connected
internally to VSS. If externally available, connect the VSSAD pin to the same voltage potential as VSS.
10.2.3 Voltage Reference High (VREFH)
VREFH is the high reference voltage for the converter. In some packages, VREFH is connected internally to
VDDAD. If externally available, VREFH can be connected to the same potential as VDDAD, or can be driven
by an external source that is between the minimum VDDAD spec and the VDDAD potential (VREFH must
never exceed VDDAD).
10.2.4 Voltage Reference Low (VREFL)
VREFL is the low reference voltage for the converter. In some packages, VREFL is connected internally to
VSSAD. If externally available, connect the VREFL pin to the same voltage potential as VSSAD.
10.2.5 Analog Channel Inputs (ADx)
The ADC module supports up to 28 separate analog inputs. An input is selected for conversion through
the ADCH channel select bits.
10.3 Register Definition
These memory mapped registers control and monitor operation of the ADC:
• Status and control register, ADCSC1and ADCSC2
• Data result registers, ADCRH and ADCRL
• Compare value registers, ADCCVH and ADCCVL
• Configuration register, ADCCFG
• Pin enable registers, APCTL1, APCTL2, APCTL3
10.3.1 Status and Control Register 1 (ADCSC1)
This section describes the function of the ADC status and control register 1 (ADCSC1). Writing ADCSC1
aborts the current conversion and initiates a new conversion (if the ADCH bits are equal to a value other
than all 1s).
MC9RS08KA8 Series Reference Manual, Rev. 3
98
Freescale Semiconductor
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