Single-chip microcomputer and method of modifying memory contents of its memory device

摘要

A CPU including a CPU-side signal line for connecting each of CPU-side memory device, OSD device, and OSD-side memory device to the CPU, and switching means for disconnecting the OSD device and OSD-side memory device from the CPU-side signal line when the CPU erases or rewrites memory contents of the CPU-side memory device through the CPU-side signal line.