mc68hc908gr16 Freescale Semiconductor, Inc, mc68hc908gr16 Datasheet - Page 47

• Manufacturer Part Number: mc68hc908gr16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 3
Analog-to-Digital Converter (ADC)
3.1 Introduction
This section describes the 10-bit analog-to-digital converter (ADC).
3.2 Features
Features of the ADC module include:
3.3 Functional Description
The ADC provides eight pins for sampling external sources at pins PTB7/KBD7–PTB0/KBD0. An analog
multiplexer allows the single ADC converter to select one of eight ADC channels as ADC voltage in
(V
When the conversion is completed, ADC places the result in the ADC data register and sets a flag or
generates an interrupt. See
3.3.1 ADC Port I/O Pins
PTB7/AD7–PTB0/AD0 are general-purpose I/O (input/output) pins that share 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 data
direction register (DDR) will not have any affect on the port pin that is selected by the ADC. A read of a
port pin in use by the ADC will return a 0.
Freescale Semiconductor
ADIN
•
•
•
•
•
•
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Eight channels with multiplexed input
Linear successive approximation with monotonicity
10-bit resolution
Single or continuous conversion
Conversion complete flag or conversion complete interrupt
Selectable ADC clock
Left or right justified result
Left justified sign data mode
). V
ADIN
is converted by the successive approximation register-based analog-to-digital converter.
Figure
3-2.
MC68HC908GR16 Data Sheet, Rev. 5.0
47