摘要 |
<p>PURPOSE:To set a home position at an optional position on a display screen by providing a means which stores the position information on an original point of the screen and decides the position shown by the position information as a home position and a means which moves a cursor according to the stored position information. CONSTITUTION:When a mouse is moved with a function switch 3 kept pushed, the pulses PX and PY are produced from an X side encoder 1 and a Y side encoder 2 respectively. An MPU 4 fetches these pulses and an X side register 5 counts the pulses PX. Meanwhile a Y side register 6 counts the pulses PY. When the push state of the switch 3 is released, a control part 9 discontinues the counting operations of both registers 5 and 6. Thus the registers 5 and 6 hold each count value of pulses. These count values of both registers serve as the information on the position of the cursor set on a display screen. The position of the cursor is defined as a home position which is newly set by a user. Thus the user can set the home position of the cursor at a desired optional point.</p> |