| 摘要 |
PURPOSE:To perform reduction processing by thinning out display data with no delay of display processing without depending upon software. CONSTITUTION:A bus 20 is connected to a CPU and supplies a chip select signal and an address strobe signal to a display system and also supplies an address and display data as well. The display system returns an ACK signal indicating the end of access to the bus 20. A subcontroller 11 processes and transmits an address to be sent to a buffer memory 12, a synchronizing signal, a CPU cycle for reading and writing display data through the bus 20, a refreshment cycle for refreshing the buffer memory 12, and a transfer cycle for transferring display data in the buffer memory 12. |
