| 摘要 |
PURPOSE:To use a device extensively for multi-function, by dividing each circuit configuration of a character receiver into blocks in the function unit, placing a common bus extensively, also providing a spare space of an extension external device, and providing soft operation function. CONSTITUTION:For instance, each circuit configuration of a character receiver R is divided into blocks by each function unit, and an assigned spare space is provided so that a captain system data input part 21, etc. are additionally placed as an external device shown by a broken line. Subsequently, on connecting buses I'BUS consisting of a data bus 6D, etc., a mounting part to which their I/O interface parts can be connected is provided. Subsequently, internal buses IBUS which are capable of extending the control operation in accordance with extension of an ROM changed to chips are fetched from a CPU block 6 of a microcomputer consisting of at least 8 bits or more, and are connected to said mounting part. In this way, it is possible to provide a system extending function having function such as information exchange with an external device, etc. |
