68HC912DG128 Datasheet, PDF (273/424 Pages) Motorola, Inc – Advance Information

Analog-To-Digital Converter (ATD)
Analog-To-Digital Converter
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
ATD Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
ATD Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
Introduction
The 68HC(9)12DG128 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 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.
1-atd
MOTOROLA
Analog-To-Digital Converter (ATD)
68HC(9)12DG128 Rev 1.0
273