Model : CT1721C, CUBLOC + GHB3224C
This command is used to select the method for refreshing the screen. To draw graphics or text, data must be written to memory. Slow mode only writes to memory between screen refreshes, so the screen redraws at a slower rate, but produces no imperfections in the display.
Fast mode writes to memory at any time, so the screen refreshes at a faster rate, but can cause imperfections in the display, such as flickering and noise.