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MC68HC908GR16A Datasheet(PDF) 50 Page - Freescale Semiconductor, Inc

No. de Pieza. MC68HC908GR16A
Descripción  M68HC08 Microcontrollers
Descarga  270 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC68HC908GR16A Datasheet(HTML) 50 Page - Freescale Semiconductor, Inc

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Analog-to-Digital Converter (ADC)
MC68HC908GR16A Data Sheet, Rev. 1.0
50
Freescale Semiconductor
3.6.1 Wait Mode
The ADC continues normal operation during wait mode. Any enabled CPU interrupt request from the ADC
can bring the MCU out of wait mode. If the ADC is not required to bring the MCU out of wait mode, power
down the ADC by setting ADCH4–ADCH0 bits in the ADC status and control register before executing the
WAIT instruction.
3.6.2 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 after an external interrupt. Allow one
conversion cycle to stabilize the analog circuitry.
3.7 I/O Signals
The ADC module has eight pins shared with port B, PTB7/AD7–PTB0/AD0.
3.7.1 ADC Analog Power Pin (VDDAD)
The ADC analog portion uses VDDAD as its power pin. Connect the VDDAD pin to the same voltage
potential as VDD. External filtering may be necessary to ensure clean VDDAD for good results.
NOTE
For maximum noise immunity, route VDDAD carefully and place bypass
capacitors as close as possible to the package.
VDDAD and VREFH are double-bonded on the MC68HC908GR16A.
3.7.2 ADC Analog Ground Pin (VSSAD)
The ADC analog portion uses VSSAD as its ground pin. Connect the VSSAD pin to the same voltage
potential as VSS.
NOTE
Route VSSAD cleanly to avoid any offset errors.
VSSAD and VREFL are double-bonded on the MC68HC908GR16A.
3.7.3 ADC Voltage Reference High Pin (VREFH)
The ADC analog portion uses VREFH as its upper voltage reference pin. By default, connect the VREFH
pin to the same voltage potential as VDD. External filtering is often necessary to ensure a clean VREFH for
good results. Any noise present on this pin will be reflected and possibly magnified in A/D conversion
values.
NOTE
For maximum noise immunity, route VREFH carefully and place bypass
capacitors as close as possible to the package. Routing VREFH close and
parallel to VREFL may improve common mode noise rejection.
VDDAD and VREFH are double-bonded on the MC68HC908GR16A.


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