| 摘要 |
PURPOSE:To interchange band-shaped pictures by providing at least one counter for memory address, at least two latches where data is held, and at least two comparators which compare the value of the counter for memory address with the contents of latches. CONSTITUTION:Data on a data bus B from a CPU is inputted to latches 7-10 to assign them as I/Os or the like of the CPU, and a strobe signal (STRB) is given by an 1/O write instruction or the like of the CPU to hold data H1-H4 in latches 7-10 independently of one another. Gate circuits 11-13 output a horizontal direction key signal S. If the key signal S outputs an image by logical '1' and masks the image by logical '0', a vertical band-shaped image is obtained. Values of data H1-H4 are changed to change bands of an image area. With respect to the vertical direction of the image, a horizontal band- shaped image is obtained by the same method. Further, a lattice-shaped image is obtained by AND between horizontal-direction and vertical-direction key signals.
|
