HD64646 Datasheet | Hitachi Semiconductor

Description The HD64645/HD64646 LCTC is a control LSI for large size dot matrix liquid crystal displays. The LCTC is software patible with the HD6845 CRTC, since its programming method of internal registers and memory addresses is based on the CRTC. A display system can be easily converted from a CRT to an LCD. The HD64646 LCTC is a modified version of the HD64645 LCTC with different LCD interface timing. The LCTC offers a variety of functions and performance features such as vertical and horizontal scrolling, and various types of character attribute functions such as reverse video, blinking, nondisplay (white or black), and an OR function for simple superimposition of character and graphic displays. The LCTC also provides DRAM refresh address output. A pact LCD system with a large screen can be configured by connecting the LCTC with the HD66110ST (column driver) and the HD66113T (mon driver) by utilizing 4-bit × 2 data outputs. Power dissipation has been lowered by adopting the CMOS process. Features - Software patible with the HD6845 CRTC - Programmable screen size  Up to 1024 dots (height)  Up to 4096 dots (width) - High-speed data transfer  Up to 20 Mbits/s in character mode  Up to 40 Mbits/s in graphic mode - Selectable single or dual screen configuration - Programmable multiplexing duty ratio: static to 1/512 duty cycle - Programmable character font  1-32 dots (height)  8 dots (width) HD64645/64646 - - - - - - - - Versatile character attributes: reverse video, blinking, nondisplay (white), nondisplay (black) OR function: superimposing characters and graphics display Cursor with programmable height, blink rate, display position, and on/off switch Vertical Smooth Scrolling and horizontal scrolling by the character Versatile display modes programmable by mode register or external pins: display on/off, graphic or character, normal or wide, attributes, and blink enable Refresh address output for dynamic RAM 4- or 8-bit parallel data transfer between...