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MC908QT2FQE Datasheet(PDF) 41 Page - Freescale Semiconductor, Inc

No. de Pieza. MC908QT2FQE
Descripción  M68HC08 Microcontrollers
Descarga  168 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC908QT2FQE Datasheet(HTML) 41 Page - Freescale Semiconductor, Inc

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MC68HC908QY/QT Family Data Sheet, Rev. 6
Freescale Semiconductor
41
Chapter 3
Analog-to-Digital Converter (ADC)
3.1 Introduction
This section describes the analog-to-digital converter (ADC). The ADC is an 8-bit, 4-channel analog-to-
digital converter. The ADC module is only available on the MC68HC908QY2, MC68HC908QT2,
MC68HC908QY4, and MC68HC908QT4.
3.2 Features
Features of the ADC module include:
4 channels with multiplexed input
Linear successive approximation with monotonicity
8-bit resolution
Single or continuous conversion
Conversion complete flag or conversion complete interrupt
Selectable ADC clock frequency
3.3 Functional Description
Four ADC channels are available for sampling external sources at pins PTA0, PTA1, PTA4, and PTA5.
An analog multiplexer allows the single ADC converter to select one of the four ADC channels as an ADC
voltage input (ADCVIN). ADCVIN is converted by the successive approximation register-based counters.
The ADC resolution is eight bits. When the conversion is completed, ADC puts the result in the ADC data
register and sets a flag or generates an interrupt.
Figure 3-2 shows a block diagram of the ADC.
3.3.1 ADC Port I/O Pins
PTA0, PTA1, PTA4, and PTA5 are general-purpose I/O pins that are shared with the ADC channels. The
channel select bits (ADC status and control register (ADSCR), $003C), 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. Read of a port pin which is in use by the ADC will return a 0
if the corresponding DDR bit is at 0. If the DDR bit is at 1, the value in the port data latch is read.


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