MC9S12KG128 Datasheet, PDF (221/600 Pages) Freescale Semiconductor, Inc – Microcontrollers

7.1.3 Modes of Operation
Chapter 7 Analog-to-Digital Converter (ATD10B16CV1)
7.1.3.1 Conversion Modes
There is software programmable selection between performing single or continuous conversion on a
single channel or multiple channels.
7.1.3.2 MCU Operating Modes
• Stop Mode
Entering Stop Mode causes all clocks to halt and thus the system is placed in a minimum power
standby mode. This halts any conversion sequence in progress. During recovery from Stop Mode,
there must be a minimum delay for the Stop Recovery Time t_SR before initiating a new ATD
conversion sequence.
• Wait Mode
Entering Wait Mode the ATD conversion either continues or halts for low power depending on the
logical value of the AWAIT bit.
• Freeze Mode
In Freeze Mode the ATD will behave according to the logical values of the FRZ1 and FRZ0 bits.
This is useful for debugging and emulation.
7.2 Signal Description
The ATD has a total of 21 external pins.
7.2.1 Detailed Signal Descriptions
7.2.1.1 ANx / PADx (x = 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
This pin serves as the analog input Channel x. It can also be configured as general purpose digital input
and/or external trigger for the ATD conversion.
7.2.1.2 ETRIG
This pin can be configured to serve as an external trigger for the ATD conversion.
Refer to device specification for availability and connectivity of this pin.
7.2.1.3 VRH, VRL
VRH is the high reference voltage, VRL is the low reference voltage for ATD conversion.
7.2.1.4 VDDA, VSSA
These pins are the power supplies for the analog circuitry of the ATD10B16C block.
MC9S12KG128 Data Sheet, Rev. 1.15
Freescale Semiconductor
221