MC912D60AVPVE8 Datasheet, PDF (349/460 Pages) Freescale Semiconductor, Inc – HC12 Microcontrollers

Technical Data — MC68HC912D60A
Section 18. Analog-to-Digital Converter
18.1 Contents
18.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
18.3 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
18.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .352
18.5 ATD Operational Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
18.6 ATD Operation In Different MCU Modes . . . . . . . . . . . . . . . . 355
18.7 General Purpose Digital Input Port Operation . . . . . . . . . . . . 357
18.8 Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . .358
18.9 ATD Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
18.2 Introduction
The 112TQFP version of the MC68HC912D60A has two identical ATD
modules identified as ATD0 and ATD1. Except for the V_DDA and V_SSA
Analog supply voltage, all pins are duplicated and indexed with ‘0’ or ‘1’
in the following description. An ‘x’ indicates either ‘0’ or ‘1’.
The 80QFP version has only one ATD available, ATD0. ATD1 is not
bonded out. As this module defaults to disabled on reset and it's I/O are
inputs by default it requires no configuration.
The ATD module is an 8-channel, 10-bit or 8-bit, multiplexed-input,
successive-approximation analog-to-digital converter. It does not
require external sample and hold circuits because of the type of charge
redistribution technique used. The ATD converter timing can be
synchronized to the system PCLK. The ATD module consists of a 16-
word (32-byte) memory-mapped control register block used for control,
testing and configuration.
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor
Analog-to-Digital Converter
Technical Data
349