DISPLAY CONTROLLER FOR DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a display controller capable of generating data for display of a lateral display state and a longitudinal display state with a few number of processes and without increasing hardware. SOLUTION: In a lateral display state, data for common display area display consisting of N×N pieces of pixels and data for right lateral display area display consisting of (M-N)×N pieces of pixels read out from a data memory for display are respectively written in a main memory area consisting of N×N pieces of addresses of a display memory and a submemory area consisting of (M-N)×N pieces of addresses of the display memory as they are. In a longitudinal display state, data for common display area display consisting of N×N pieces of pixels read out from the data memory for display and data for lower side display area display consisting of (M-N)×N pieces of pixels read out from the data memory for display are respectively rotated at 90 degrees in a counterclockwise direction to be respectively written in the main memory of the display memory and the submemory of the display memory.