SED1335F0A

The SED1335F0A is one member of the SED1335F series.It has the following features including Text,graphics and combined text/graphics display modes;Three overlapping screens in graphics mode; 640*256 pixel LCD panel display resolution;Programmable cursor control;Smooth horizontal and vertical scrolling of all or part of the display;1/2-duty to 1/256-duty LCD drive;Up to 64 Kbytes of external static RAM frame buffer memory;Internal character generator;160, 5 *7 pixel characters in internal maskprogrammed character generator ROM;Up to 64, 8*16 pixel characters in external character generator RAM.

The SED1335F is a family of versatile LCD controller ICs that can display text and graphics on a medium size LCD panel. The software is compatible among all three chips. S-MOS recommends new designs use the SED1335 since the SED1330 will gradually be replaced by the SED1335.The SED1335F can display layered text and graphics, scroll the display in any direction and partition the display into multiple screens.The SED1335F stores text, character codes and bit-mapped graphics data in external frame buffer memory.Display controller functions include transferring data from the controlling microprocessor to the buffer memory, reading memory data, converting data to display pixels and generating timing signals for the buffer memory, TV monitor and LCD panel.

The peak supply current drawn by the SED1335F may be up to ten times the average supply current. The power supply impedance must be kept as low as possible by ensuring that supply lines are sufficiently wide and by placing 0.47 mF decoupling capacitors that have good high-frequency response near the device's supply pins.In general, the internal registers of the SED1335F is modified as each command parameter is input. However,the microprocessor does not have to set all the parameters of a command and may send a new command before all parameters have been input. The internal registers for the parameters that have been input will have been changed but the remaining parameter registers are unchanged.The best way of displaying inverted characters is to Exclusive-OR the text layer with the graphics background layer.However, inverted characters at the top or left of the screen are difficult to read as the character origin is at the top-left of its bitmap and there are no background pixels either above or to the left of these characters.