MC68HC908GP16CFB Freescale Semiconductor, MC68HC908GP16CFB Datasheet - Page 45

• Manufacturer Part Number: MC68HC908GP16CFB
• Description: MCU 8-BIT 16K FLASH 44-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GP16CFB

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 33
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

3.3.1 ADC Port I/O Pins
PTB7:PTB0 are general-purpose I/O pins that are shared with the ADC channels. See
Input/Output (I/O) Ports
The channel select bits define which ADC channel/port pin will be used as the input signal. The ADC
overrides the port logic when that port is selected by the ADC multiplexer. The remaining ADC
channels/port pins are controlled by the port logic and can be used as general-purpose input/output (I/O)
pins. Writes to the port register or DDR will not have any effect on the port pin that is selected by the ADC.
Read of a port pin which is in use by the ADC will return a logic 0.
3.3.2 Voltage Conversion
When the input voltage to the ADC equals V
input voltage equals V
straight-line linear conversions. All other input voltages will result in $3FF if greater than V
if less than V
Freescale Semiconductor
INTERNAL
DATA BUS
REFL
AIEN
Input voltage should not exceed the analog supply voltages. See
Analog-to-Digital Converter (ADC)
INTERRUPT
LOGIC
.
READ PTB
BUS CLOCK
COCO/IDMAS
CGMXCLK
REFL
(PORTS).
CONVERSION
COMPLETE
, the ADC converts it to $000. Input voltages between V
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
ADIV[2:0]
Figure 3-2. ADC Block Diagram
GENERATOR
ADC DATA REGISTERS
CLOCK
ADC CLOCK
REFH
ADICLK
ADC
, the ADC converts the signal to $3FF (full scale). If the
NOTE
Characteristics.
ADC VOLTAGE IN
ADVIN
DISABLE
CHANNEL
SELECT
20.10
ADC CHANNEL x
REFH
Functional Description
PTx
PTB
Chapter 12
and V
REFH
ADCH[4:0]
REFL
and $000
are
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