TRANSMISSION METHOD, RECEPTION METHOD AND COMMUNICATION METHOD AND BI-DIRECTIONAL BUS SYSTEM

摘要

PURPOSE:To make it possible to reduce the traffic amount of a bi-directional bus 1, to improve transmission efficiency and to simplify a communication procedure. CONSTITUTION:A microprocessor 22 transmits data to a TV 10 via a bi- directional bus 1 by dividing transmission data into plural frames, by locking the device of a reception side for the control bit of the first frame and by releasing the lock of the device of the reception side for the control bit of the last frame, when data amount to be transmitted is larger than the data capacity of a data field 55. The microprocessor 12 detects the write in the lock state of data based on the control bit, invalidates a reception signal when the transmission signal from a VDP 30 is received and notifies the VDP 30 that data is in the lock state.