Freescale Semiconductor, Inc.
Advance Information — 68HC(9)12D60
Section 18. Analog-to-Digital Converter
18.1 Contents
18.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .323
18.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .324
18.4 ATD Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .325
18.5 ATD Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .336
18.2 Introduction
The 112TQFP version of the 68HC(9)12D60 has two identical ATD
modules identified as ATD0 and ATD1. Except for the V
and V
SSA
DDA
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 P clock. The ATD module consists of a 16-
word (32-byte) memory-mapped control register block used for control,
testing and configuration.
68HC(9)12D60 — Rev 4.0
MOTOROLA
Advance Information
Analog-to-Digital Converter
323
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA [ MOTOROLA ]
