MC68HC908BD48 Datasheet, PDF (193/290 Pages) Freescale Semiconductor, Inc – Microcontrollers

Technical Data — MC68HC908BD48
Section 15. DDC12AB Interface
15.1 Contents
15.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
15.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
15.4 I/O Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
15.5 DDC Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
15.6 Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
15.6.1 DDC Address Register (DADR) . . . . . . . . . . . . . . . . . . . . . 196
15.6.2 DDC2 Address Register (D2ADR) . . . . . . . . . . . . . . . . . . . 197
15.6.3 DDC Control Register (DCR) . . . . . . . . . . . . . . . . . . . . . . . 198
15.6.4 DDC Master Control Register (DMCR) . . . . . . . . . . . . . . . 199
15.6.5 DDC Status Register (DSR) . . . . . . . . . . . . . . . . . . . . . . . . 202
15.6.6 DDC Data Transmit Register (DDTR) . . . . . . . . . . . . . . . . 204
15.6.7 DDC Data Receive Register (DDRR). . . . . . . . . . . . . . . . . 205
15.7 Programming Considerations . . . . . . . . . . . . . . . . . . . . . . . . . 206
15.2 Introduction
This DDC12AB Interface module is used by the digital monitor to show
its identification information to the video controller. It contains DDC1
hardware and a two-wire, bidirectional serial bus which is fully
compatible with multi-master IIC bus protocol to support DDC2AB
interface.
This module not only can be applied in internal communications, but can
also be used as a typical command reception serial bus for factory setup
and alignment purposes. It also provides the flexibility of hooking
additional devices to an existing system for future expansion without
adding extra hardware.
MC68HC908BD48 — Rev. 1.0
MOTOROLA
DDC12AB Interface
Technical Data
193