MC9S12T64 Datasheet, PDF (514/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Analog to Digital Converter (ATD)
level mode while a sequence is completing, another sequence will be
triggered immediately.
General Purpose
Digital Input Port
Operation
The input channel pins can be multiplexed between analog and digital
data. As analog inputs, they are multiplexed and sampled to supply
signals to the A/D converter. As digital inputs, they supply external input
data that can be accessed through the digital port register PORTAD
(input-only).
The analog/digital multiplex operation is performed in the input pads.
The input pad is always connected to the analog inputs of the ATD
module. The input pad signal is buffered to the digital port registers. This
buffer can be turned on or off with the ATDDIEN register. This is
important so that the buffer does not draw excess current when analog
potentials are presented at its input.
Low Power Modes
The ATD module can be configured for lower MCU power consumption
in 3 different ways:
• Stop Mode
• Wait Mode with AWAI=1
• Power down by writing ADPU=0 (Note that all ATD registers
remain accessible.)
Note that the reset value for the ADPU bit is zero. Therefore, when this
module is reset, it is reset into the power down state. Once the ATD
module is configured for low power, it aborts any conversion sequence
in progress. When ATD module powers up again (exit Stop Mode, exit
Wait Mode with AWAI=1 or set ADPU=1), it requires a recovery time
period.
MC9S12T64Revision 1.1.1
Analog to Digital Converter (ATD)
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