A system for horizontal scrolling of display data

PROBLEM TO BE SOLVED: To shift data by a horizontal shift value(HSV) with a number of clock cycles smaller than the HSV by providing a horizontal scroll controller and a register in order to enable the horizontal scroll of a message on an LCD panel without a need for making a microcontroller rewrite the whole of a RAM. SOLUTION: In this system, an MSB(most significant bit) counter and an LSB(least significant bit) counter are provided in a horizontal scroll controller 24 in order to perform a countdown from the HSV. The MSB counter applies a shift-by-8 signal to a horizontal scroll shift register 28 during the countdown and the LSB counter applies a shift-by-1 signal to the register 28 during the countdown. As a result, data in the shift register 28 are shifted in the block unit of 8 or in the block unit of 1 and required clock cycles are reduced.