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GENERAL DESCRIPTION

The MSM6794 is a dot matrix graphic liquid crystal display LSI device to display bit maps. It drives an LCD panel for dot matrix graphic display under the control of a 4- or 8-bit microcomputer.

All necessary functions for driving a bit map type LCD are built in on one chip. Therefore,by using the MSM6794, a bit map type dot matrix graphic liquid crystal display system can be implemented with a small number of chips.

Since 1-bit data of the display RAM corresponds to the light-on/off of 1-dot of the LCD panel (bit map system), a flexible display, including kanji display, is possible. One chip comprises a graphic display system of a maximum of 128·48 dots. This display can be expanded by using multiple chips.

The MSM6794 uses CMOS process. Since it is an internal RAM type, the MSM 6794 features low power consumption, and is suited to display for battery-driven portable equipment.

FEATURES

? Segment outputs : Maximum of 128

? Common outputs : Maximum of 48

? Display duty : 1/33, 1/41, 1/44, 1/48

? Bit map type internal RAM : 6,144 bits (128·48 bits)

? Display data I/F : 8-bit parallel/serial switchable

? Standby function by program

? LCD drive bias resistor (externally connected)

? Built-in voltage multiplier circuit

? LOGIC voltage : 2.7 to 5.5V

? LCD driving voltage : VBI 5 to 12V (positive voltage)

? Low current consumption : Maximum of 10mA (in standby mode)

? Number of pads : 224