MC912DG128ACPVE Datasheet, PDF (367/478 Pages) Freescale Semiconductor, Inc – Upward compatible with M68HC11 instruction set

Freescale Semiconductor, Inc.
Technical Data — MC68HC912DT128A
Section 19. Analog-to-Digital Converter
19.1 Contents
19.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
19.3 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .369
19.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .370
19.5 ATD Operational Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .372
19.6 ATD Operation In Different MCU Modes . . . . . . . . . . . . . . . . 373
19.7 General Purpose Digital Input Port Operation . . . . . . . . . . . .375
19.8 Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . .376
19.9 ATD Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
19.2 Introduction
The MC68HC912DT128A 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 PCLK. The ATD module consists of a 16-
word (32-byte) memory-mapped control register block used for control,
testing and configuration.
MC68HC912DT128A — Rev 4.0
MOTOROLA
Analog-to-Digital Converter
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Technical Data
367