The Z89331 One-Time Programmable (OTP) Digital Television Controller is designed to provide complete audio and video control of television receivers, video recorders, and advanced on-screen display facilities. The Z89331 features a Z89C00 RISC processor core that controls on-board peripheral functions and registers using the standard processor instruction set. Character attributes can be controlled through two modes: the on-screen display Character-Control Mode and the Closed-Caption Mode. The Character-Control Mode provides access to the full set of attribute controls, allowing the modification of attributes on a character-by-character basis. The insertion of control characters permits direction of other character attributes. Closed-caption text can be decoded directly from the composite video signal and displayed on-screen with the assistance of the processor's digital signal processing (DSP) capabilities. The fully customized 512 character set, formatted in two 256 character banks, can be displayed with a host of display attributes that include underlining, italics, blinking, eight foreground/background colors, character position offset delay, and background transparency.