The ICM7245 is an 8-character, alphanumeric display driver

and controller which provides all the circuitry required to

interface a microprocessor or digital system to a 16-segment

display with internal pull-up resistors. 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 CLR 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

? Single supply +3.3V operation

? 16-Segment fonts with decimal point

? Up to 8 character display driver

? Has internal pull-up resistors of 136? Typical

? 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

? Character and segment drivers, All MUX scan circuitry, 8x6

static memory and 64-character ASCll font generator

included on-chip

? Pb-free (RoHS compliant)