| 摘要 |
<p>PURPOSE: To use a device in a system satisfying a high bit rate performance by adding a sequential serial access function to a MOS dynamic RAM. CONSTITUTION: A memory 5 has not only a serial port 2 but also a parallel port 6, and the port 6 is connected to a multiple address/data input/output bus 7 of a microcomputer 8. The memory 5 receives the address on the bus 7 to prescribe an address for the serial port 2 and prescribes also an address for memory read or write passing the parallel port 6. The memory 5 has a memory array 10 which consists of a matrix of memory cells and is divided in accordance with the size and form of a video display device 1 and the form of a selected memory. In this case, a circuit is provided which gives a first clock frequency for microprocessor and a second clock frequency which shifts video data from a register to a video signal input. Thus, a device suitable for a display system which has an improved resolution is obtained.</p> |
