MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 246

• Manufacturer Part Number: MC68HC908KX2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Analog-to-Digital Converter (ADC)
17.3 Features
17.4 Functional Description
17.4.1 ADC Port I/O Pins
Technical Data
246
Features of the ADC module include:
The ADC provides four pins for sampling external sources at pins
PTB3
select one of four ADC channels as ADC voltage in (ADCVIN). ADCVIN
is converted by the successive approximation register-based counters.
When the conversion is completed, ADC places the result in the ADC
data register and sets a flag or generates an interrupt. See
The MC68HC908KX8 uses V
PTB3–PTB0 are general-purpose input/output (I/O) pins that are shared
with the ADC channels.
The channel select bits define which ADC channel/port pin will be used
as the input signal. The ADC overrides the port I/O logic by forcing that
pin as input to the ADC. The remaining ADC channels/port pins are
controlled by the port I/O logic and can be used as general-purpose I/O.
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 if the corresponding DDR bit is at logic 0. If the
DDR bit is at logic 1, the value in the port data latch is read.
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Four channels with multiplexed input
Linear successive approximation
8-bit resolution
Single or continuous conversion
Conversion complete flag or conversion complete interrupt
Selectable ADC clock
PTB0. An analog multiplexer allows the single ADC converter to
Analog-to-Digital Converter (ADC)
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
DD
as the high voltage reference.
Figure
MOTOROLA
17-1.