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MC68HC08AS32A Datasheet(PDF) 55 Page - Motorola, Inc

No. de Pieza. MC68HC08AS32A
Descripción  Microcontrollers
Descarga  296 Pages
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Fabricante  MOTOROLA [Motorola, Inc]
Página de inicio  http://www.freescale.com
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MC68HC08AS32A Datasheet(HTML) 55 Page - Motorola, Inc

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Analog-to-Digital Converter (ADC)
Functional Description
MC68HC08AS32A — Rev. 1
Data Sheet
MOTOROLA
Analog-to-Digital Converter (ADC)
55
Figure 3-2. ADC Block Diagram
3.3.2 Voltage Conversion
When the input voltage to the ADC equals VREFH (see 18.7 ADC Characteristics),
the ADC converts the signal to $FF (full scale). If the input voltage equals
VSSA/VREFL the ADC converts it to $00. Input voltages between VREFH and
VSSA/VREFL are a straight-line linear conversion. All other input voltages will result
in $FF if greater than VREFH and $00 if less than VSSA/VREFL.
NOTE:
Input voltage should not exceed the analog supply voltages.
3.3.3 Conversion Time
Sixteen ADC internal clocks are required to perform one conversion. The ADC
starts a conversion on the first rising edge of the ADC internal clock immediately
following a write to the ADSCR. If the ADC internal clock is selected to run at 1
MHz, then one conversion will take 16
µs to complete. But since the ADC can run
almost completely asynchronously to the bus clock, (for example, the ADC is
INTERNAL
DATA BUS
READ DDRB/DDRB
WRITE DDRB/DDRD
RESET
WRITE PTB/PTD
READ PTB/PTD
PTBx/PTDx
DDRBx/DDRDx
PTBx/PTDx
INTERRUPT
LOGIC
CHANNEL
SELECT
ADC
CLOCK
GENERATOR
CONVERSION
COMPLETE
ADC VOLTAGE IN
ADCVIN
ADC CLOCK
CGMXCLK
BUS CLOCK
ADCH[4:0]
ADC DATA REGISTER
ADIV[2:0]
ADICLK
AIEN
COCO
DISABLE
DISABLE
ADC CHANNEL x
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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