MC68HC908GR8CDW Freescale Semiconductor, MC68HC908GR8CDW Datasheet - Page 82

• Manufacturer Part Number: MC68HC908GR8CDW
• Description: IC MCU 8K FLASH 8MHZ 28-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GR8CDW

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 17
• Program Memory Size: 7.5KB (7.5K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Analog-to-Digital Converter (ADC)
5.4.2 Voltage Conversion
5.4.3 Conversion Time
5.4.4 Conversion
Technical Data
82
NOTE:
When the input voltage to the ADC equals V
signal to $FF (full scale). If the input voltage equals V
converts it to $00. Input voltages between V
straight-line linear conversion. All other input voltages will result in $FF,
if greater than V
Inside the ADC module, the reference voltage, V
ADC analog power V
ground V
analog supply voltages
For operation, V
separate traces
Conversion starts after a write to the ADSCR. One conversion will take
between 16 and 17 ADC clock cycles. The ADIVx and ADICLK bits
should be set to provide a 1 MHz ADC clock frequency.
In continuous conversion mode, the ADC data register will be filled with
new data after each conversion. Data from the previous conversion will
be overwritten whether that data has been read or not. Conversions will
continue until the ADCO bit is cleared. The COCO/IDMAS bit is set after
the first conversion and will stay set until the next write of the ADC status
and control register or the next read of the ADC data register.
In single conversion mode, conversion begins with a write to the
ADSCR. Only one conversion occurs between writes to the ADSCR.
Number of bus cycles = conversion time x bus frequency
Freescale Semiconductor, Inc.
For More Information On This Product,
DDAD
Analog-to-Digital Converter (ADC)
Conversion time =
Go to: www.freescale.com
. Therefore, the ADC input voltage should not exceed the
REFH
DDAD
.
DDAD
should be tied to the same potential as V
; and V
16 to17 ADC cycles
REFL
ADC frequency
is connected to the ADC analog
REFH
REFH
MC68HC908GR8 — Rev 4.0
REFH
, the ADC converts the
and V
is connected to the
REFL ,
REFL
the ADC
MOTOROLA
are a
DD
via