MC2674 Controller Datasheet

MC2674 Datasheet PDF, Equivalent


Part Number

MC2674

Description

Advanced Video Display Controller

Manufacture

Motorola

Total Page 30 Pages
Datasheet
Download MC2674 Datasheet


MC2674
MOTOROLA
~SEMICONDUCTOR~~~~~~~~~~~~~
TECHNICAL DATA
MC2674
Advance Information
Advanced Video Display Controller (AVDC)
3
The MC2674 advanced video display controller (AVDC) is a programmable device designed for
use in CRT terminals and display systems that employ raster-scan techniques. The AVDC generates
the vertical and horizontal timing signals necessary for the display of interlaced or non-interlaced
data on a CRT monitor. It provides consecutive addressing to a user specified display buffer mem-
ory domain and controls the CPU-display buffer interface for various buffer configuration modes. A
variety of operating modes, display formats, and timing profiles can be implemented by program-
ming the control registers in the AVDC.
A minimum CRT terminal system configuration consists of an AVDC, a keyboard controller, an
asynchronous communications interface adapter, character ROM, and an attributes controller. Other
necessary parts of the system are a single-chip microcomputer such as the MC6809, display buffer
RAM, and a small amount of TIL for miscellaneous address decoding, interface, and control. Sys-
tem complexity can be enhanced by upgrading the microprocessor and expanding via the system
address and data buses.
• 4 MHz Character Rate
• 1 to 256 Characters Per Row
• 1 to 16 Raster Lines Per Character Row
• Bit Mapped Graphics Mode
• Programmable Horizontal and Vertical Sync Generators
• Interlaced or Non-Interlaced Operation
• Up to 64K RAM Address for Multiple-Page Operation
• Readable, Writeable, and Incrementable Cursor
• Programmable Cursor Size and Blink
• AC Line Lock
• Automatic Wraparound of RAM
• Automatic Split Screen
• Automatic Bidirectional Soft Scrolling
• Programmable Scan Line Increment
• Row Table Addressing Mode
• Double Height Tops and Bottoms
• Double Width Control Output
• Selectable Buffer Interface Modes
• Dynamic RAM Refresh
• Completely TTL Compatible
• Single +5-Volt Power Supply
• Power-On Reset Circuit
• Applications Include: CRT Terminals, Word Processing Systems, Small Business Computers,
and Home Computers
This document contains information on a new prod~ct. Specifications and information herein are subject to change without notice.
MOTOROLA MICROPROCESSOR DATA
3-28

MC2674
Interface
Read/
Write
Control
Logic
Address
Decoder
DO-D7
Data
Bus
Drivers
Clock
Buffer
MC2674
BLOCK DIAGRAM
Control
Initialization,
Pointer
and
Display
Registers
Command
Decode
Logic
Interrupt
Logic
Status
Register
Display
Memory
Handshake
Logic
CTRL1
CTRL2
CTRL3
Compare
Logic
I
Timing
Timing Chain
and
Decode Logic
ACLL
HSYNC
VSYNC/ CSYNC
BLANK
MOTOROLA MICROPROCESSOR DATA
3-29


Features MOTOROLA ~SEMICONDUCTOR~~~~~~~~~~~~~ TE CHNICAL DATA MC2674 Advance Informati on Advanced Video Display Controller (A VDC) 3 The MC2674 advanced video disp lay controller (AVDC) is a programmable device designed for use in CRT termina ls and display systems that employ rast er-scan techniques. The AVDC generates the vertical and horizontal timing sign als necessary for the display of interl aced or non-interlaced data on a CRT mo nitor. It provides consecutive addressi ng to a user specified display buffer m emory domain and controls the CPU-displ ay buffer interface for various buffer configuration modes. A variety of opera ting modes, display formats, and timing profiles can be implemented by program ming the control registers in the AVDC. A minimum CRT terminal system configur ation consists of an AVDC, a keyboard c ontroller, an asynchronous communicatio ns interface adapter, character ROM, an d an attributes controller. Other neces sary parts of the system are a single-chip microcomputer such a.
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