mc68hc908ld64 Freescale Semiconductor, Inc, mc68hc908ld64 Datasheet - Page 182

• Manufacturer Part Number: mc68hc908ld64
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Analog-to-Digital Converter (ADC)
13.6.2 Stop Mode
13.7 I/O Signals
13.7.1 ADC Analog Power Pin (VDDA)
13.7.2 ADC Analog Ground Pin (VSSA)
13.7.3 ADC Voltage Reference High Pin (VRH)
13.7.4 ADC Voltage Reference Low Pin (VRL)
13.7.5 ADC Voltage In (ADCVIN)
Data Sheet
182
NOTE:
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.
The ADC module has six channels that are shared with port C I/O pins,
PTC5/ADC5–PTC0/ADC0.
The ADC analog portion uses VDDA as its power pin. Connect the
VDDA pin to the same voltage potential as VDD. External filtering may
be necessary to ensure clean VDDA for good results.
Route VDDA carefully for maximum noise immunity and place bypass
capacitors as close as possible to the package.
The ADC analog portion uses VSSA as its ground pin. Connect the
VSSA pin to the same voltage potential as VSS.
VRH is the high voltage reference for the ADC.
VRL is the low voltage reference for the ADC.
ADCVIN is the input voltage signal from one of the six ADC channels to
the ADC module.
Analog-to-Digital Converter (ADC)
MC68HC908LD64
Freescale Semiconductor
—
Rev. 3.0