HORIZONTAL SYNCHRONIZING SIGNAL COINCIDENCE CIRCUIT

摘要

The circuit generating horizontal sync. signal without interruption of system clock even when the horizontal sync. signal from a character data generator is out of phase. It includes a data channel demultiplexer (1) for generating vertical sync. signal (VSYNC), a N-MOS (NM1) connected to a clock terminal (PXCK1), a NOR gate (NR1) of which output port is connected to the input port of itself, and a N-MOS (NM2) of which gate is connected to a clock port (PXCK2).