6

FN6675.1

January 22, 2009

Pin Descriptions

SIGNAL

PIN

FUNCTION

D0 - D5

4 thru 9

6-Bit ASCll Data input pins (active high).

CS

10

Chip Select from µP address decoder, etc.

WR

13

WRite pulse input pin (active low). For an active high write pulse, CS can be used.

MODE

29

Selects data entry MODE. High selects Sequential Access (SA) mode where first entry is displayed

in “leftmost” character and subsequent entries appear to the “right”. Low selects the Random

Access (RA) mode where data is displayed on the character addressed via A0 thru A2 Address pins.

A0/SEN

28

In RA mode it is the LSB of the character Address. In SA mode it is used for cascading devices for

displays of more than 8 characters (active high enables device controller).

A1/CLR

27

In RA mode this is the second bit of the address. In SA mode, a low input will CLeaR the Serial

Address Counter, the Data Memory and the display.

A2/DISP FULL

26

In RA mode this is the MSB of the Address. In SA mode, the output goes high after 8 entries,

indicating DISPlay FULL.

OSC/OFF

25

oscillator can be applied to this pin. A low at this input sets the device into a (shutdown) mode, shutting

OFF the display and oscillator but retaining data stored in memory.

SEG d1, SEG a1,

SEG a2,

SEG j, SEG h, DP,

SEG d2, SEG f,

SEG i, SEG b, SEG

g2, SEG I,

SEG m, SEG e,

SEG g1, SEG k,

SEG c

1 thru 3,

30 thru 38

40 thru 44

SEGment driver outputs.

CHAR8 thru

CHAR5,

CHAR4 thru

CHAR2,

CHAR1

14 thru 17,

19 thru 21,

24

CHARacter driver outputs.

ICM7244

ICM7244