| 摘要 |
PURPOSE:To improve pattern drawing performance and controller execution efficiency by providing a temporary memory which operates at faster speed than a pattern drawing memory and a data generator before the pattern drawing memory. CONSTITUTION:FIFO which constitutes a temporary memory 4 can operate without weight cycle because data are written into FIFO at high speed. Until a left half character pattern is written into a pattern drawing memory 9, it is possible to perform address calculation for right half data and also obtain a spare time (alpha). During the spare time (alpha), a controller 1 periodically monitors a flipflop 5, and if the content is at low level, executes the operation to set an address, read the right half character pattern from a character pattern memory 3 and write it into the temporary memory 4. While the right half character pattern is read by a data generator 6 and a pattern is drawn to a pattern drawing memory 9, post- and pretreatments of data are executed. As soon as the flipflop 5 outputs a low level signal, next character pattern can be transferred. |
