• For Medium-Scale LCD

• Low Operating Voltage 2.7 to 5.0V

• On-Chip Character Generator ROM

■ DESCRIPTION

The SED1335 is a CMOS low-power dot matrix liquid crystal graphic display controller. The device stores in external RAM display data sent by an 8-bit microcomputer, and generates all the signals required by the LCD drivers. The LSI incorporates an internal character generator ROM which supports user-defined characters (also an external CGROM can be supported). The SED1335 can be interfaced to high-speed microprocessors such as the Intel family or Motorola family. The controller supports a set of rich commands that will allow the user to create a layered display of characters and graphics. Also, the controller functions as a pipeline buffer between the MPU and display memory so that low-cost, medium-speed SRAM can be used.

■ FEATURES

• CMOS low-power graphic and character display controller

• Selectable MPU interface is compatible with both the Intel family and the Motorola family

• Smooth scrolling support: Horizontal and vertical scroll Scrolling of selected areas of the display

• Multimode display:

2 layers of overlapping characters and graphics

3 layers of overlapping graphics

• Selectable display synthesis:

Inverse video

Flashing display, cursor on/off/blink

Under and bar cursor, block cursor

Simple animation

• Programmable cursor

• Internal character generator ROM

• Supports external character generator ROM:

8 × 8 or 8 × 16 pixel characters

Allowing mixing of ROM and RAM character sets

• Supports 64K bytes of memory:

4K bytes of user-definable characters

60K bytes of display memory

in 2 of 32K × 8 100ns SRAM

or in 8 of 8K × 8 100ns SRAM

• Display duty .................... 1/2 to 1/256

• Low power dissipation

5mA (typical)

0.05µA (typical), standby

• Logic power supply .......................... 2.7 to 5.5V

• Package: .................. Plastic QFP5-60 pin (F0A)

Plastic QFP6-60 pin (F0B)