DESCRIPTION
The 83C055, Microcontroller for Television and Video (MTV) applications, is a derivative of Philips’ industry standard 80C51 microcontroller.
The 83C055 is intended for use as the central control mechanism in a television receiver or tuner.

FEATURES
• Masked ROM sizes:
    – 8 kbytes (83C845)
    – 12 kbytes (83C145)
    – 16 kbytes (83C055)
    – 16 kbytes OTP (87C055)
• RAM: 256 bytes
• On Screen Display (OSD) controller
• Three digital video outputs
• Multiplexer/mixer and background intensity controls
• Flexible formatting with OSD New Line option
• 128 × 10 bits display RAM
• Designed for reduced Radio Frequency Interference
(RFI)
• Character generator ROM:
    – character format 18 lines × 14 dots
    – 60 visible characters
    – 4 special characters
• Eight text shadowing modes
• Text colour selectable per character
• Background colour selectable per word
• Background colour versus video selectable per character
• Eight 6-bit Pulse Width Modulators (PWM) for analog voltage integration
• One 14-bit PWM for high-precision voltage integration
• Digital-to-analog converter and comparator with 3 inputs multiplexer
• Nine dedicated I/Os plus 28 port bits (15 port bits with alternative uses)
• 4 high current open-drain port outputs
• 12 high voltage (+12 V) open-drain outputs
• Programmable video input and output polarities
• 80C51 instruction set
• No external memory capability
• Plastic shrink dual in-line package (0.07 inch centre pins)
• High-speed CMOS technology
• Power supply: 5 V ±10%.

APPLICATIONS
    Providing tuner functions and an OSD facility, it represents a next generation replacement for the currently available parts.