مدار مجتمع (آی سی) آی سی‌کاربرد ویژه

Product Attributes

Introduction

The RCA-CDP1869C and CDP1870C video interface system is designed for use in CDP1800-Series Microprocessor systems. It consists of the CDP1869C address and sound generator and the CDP1870C color video generator. These two LSI CMOS circuits interface directly with the CDP1802 and CDP1804A microprocessor/microcomputer families. The ViS offers a variety of formats for the display and modification of data under software control, with either NTSC or PAL compatible output signals. The display device can be a video monitor or a standard TV receiver with an RF modulator. Composite sync, luminance, and chrominance are combined externally to form a single system-output. (With the RGB Bond-Out option [CDP1876C], Red, Green, and Blue outputs are provided to drive the CRT color amplifiers directly.) External sync inputs are also provided to allow picture overlays in existing TV chassis. A sound output provides white noise and eight octaves of programmable tones. The output amplitude is variable in 16 steps from 0V to 0.78Voo. This output is particularly useful in video game applications.

Features

• DoT frequency = ±5.67 MHz (PAL = 5.626 MHz), easily adaptable for RF (antenna) input
• CPU clock independent (%DOT rate provided)
• CPU not involved in screen refresh
• Non-interlaced
• Graphics and motion
• Up to 256 different characters
• Character memory may be any combination of ROM or RAM
• Programmable for 12/24 rows x 20/40 char/row
• 6x8 or 8x16 char.matrix (6×9 for PAL)
• Character generation approach minimizes memory
• PAL and NTSC compatible
• Page memory is accessed as extension of CPU memory during non-display time
• Composite sync, luminance, and chrominance outputs
• Programmable background color
• Hardware scroll capability
• Audio generator (576 selectable tones covering 8 octaves) and white noise generator
• Both tones and white noise can be enveloped from 0 to 0.78Voo in 16 steps
• External horizontal and vertical sync inputs allow for integration into existing chassis for character-on picture overlays
• Teletext compatible format
• RGB bond-out option available (CDP1876C)

Applications

• Video game applications