MC68HC908LD64 Datasheet, PDF (235/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Data Sheet — MC68HC908LD64
Section 16. DDC12AB Interface
16.1 Contents
16.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
16.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
16.4 I/O Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
16.5 DDC Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
16.6 DDC Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
16.6.1 DDC Address Register (DDCADR) . . . . . . . . . . . . . . . . . . 238
16.6.2 DDC2 Address Register (DDC2ADR) . . . . . . . . . . . . . . . . 239
16.6.3 DDC Control Register (DDCCR) . . . . . . . . . . . . . . . . . . . . 240
16.6.4 DDC Master Control Register (DDCMCR) . . . . . . . . . . . . . 241
16.6.5 DDC Status Register (DDCSR) . . . . . . . . . . . . . . . . . . . . . 244
16.6.6 DDC Data Transmit Register (DDCDTR) . . . . . . . . . . . . . . 246
16.6.7 DDC Data Receive Register (DDCDRR) . . . . . . . . . . . . . . 247
16.7 Programming Considerations . . . . . . . . . . . . . . . . . . . . . . . . . 248
16.2 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.
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor
DDC12AB Interface
Data Sheet
235