The ICM7243 is an 8-character, alphanumeric display driver

and controller which provides all the circuitry required to

interface a microprocessor or digital system to a 14-segment

or 16-segment display. It is primarily intended for use in

microprocessor systems, where it minimizes hardware and

software overhead. Incorporated on-chip are a 64-character

ASClI decoder, 8x6 memory, high power character and

segment drivers, and the multiplex scan circuitry.

6-bit ASCll data to be displayed is written into the memory

directly from the microprocessor data bus. Data location

depends upon the selection of either Sequential

(MODE = 1) or Random access mode (MODE = 0). In the

Sequential Access mode the first entry is stored in the

lowest location and displayed in the “l(fā)eft-most” character

position. Each subsequent entry is automatically stored in

the next higher location and displayed to the immediate

“right” of the previous entry. A DISPlay FULL signal is

provided after 8 entries; this signal can be used for

cascading devices together. A CLeaR pin is provided to

clear the memory and reset the location counter. The

Random Access mode allows the processor to select the

memory address and display digit for each input word.

The character multiplex scan runs whenever data is not

being entered. It scans the memory and CHARacter drivers,

and ensures that the decoding from memory to display is

done in the proper sequence. Intercharacter blanking is

provided to avoid display ghosting

特性 Features

? 14-Segment and 16-Segment Fonts with Decimal Point

? Mask Programmable for Other Font-Sets Up to 64

Characters

? Microprocessor Compatible

? Directly Drives LED Common Cathode Displays

? Cascadable Without Additional Hardware

? Standby Feature Turns Display Off; Puts Chip in Low

Power Mode

? Sequential Entry or Random Entry of Data Into Display

? Single +5V Operation

? Character and Segment Drivers, All MUX Scan Circuitry,

8x6 Static Memory and 64-Character ASCll Font

Generator Included On-Chip

? Pb-Free Available (RoHS Compliant)