HCMS-2913 datasheet(8/16 Pages) HP

8 / 16 page

Reset

Reset initializes the Control

Registers (sets all Control

places the display in the sleep

mode. The Reset pin should be

connected to the system power-on

reset circuit. The Dot Registers

are not cleared upon power-on or

by Reset. After power-on, the Dot

however, Reset will put the

display in sleep mode, thereby

blanking the LEDs. The Control

are cleared to all zeros by Reset.

To operate the display after being

Reset, load the Dot Register with

logic lows. Then load Control

Word 0 with the desired bright-

ness level and set the sleep mode

bit to logic high.

Dot Register

The Dot Register holds the

pattern to be displayed by the

Display Overview

The HCMS-29xx series is a family

of LED displays driven by

on-board CMOS ICs. The LEDs

are configured as 5 x 7 font

characters and are driven in

groups of 4 characters per IC.

Each IC consists of a 160-bit shift

7-bit Control Words, and refresh

circuitry. The Dot Register

contents are mapped on a

one-to-one basis to the display.

Thus, an individual Dot Register

bit uniquely controls a single

LED.

8-character displays have two ICs

that are cascaded. The Data Out

line of the first IC is internally

connected to the Data In line of

the second IC forming a 320-bit

Dot Register. The display’s other

control and power lines are

connected directly to both ICs. In

16-character displays, each row

functions as an independent

8-character display with its own

320-bit Dot Register.

LEDs. Data is loaded into the Dot

procedure shown in Table 1 and

the Write Cycle Timing Diagram.

First RS is brought low, then CE

is brought low. Next, each

successive rising CLK edge will

shift in the data at the D

IN pin.

Loading a logic high will turn the

corresponding LED on; a logic

low turns the LED off. When all

160 bits have been loaded (or 320

bits in an 8-digit display), CE is

brought to logic high.

When CLK is next brought to

logic low, new data is latched into

the display dot drivers. Loading

data into the Dot Register takes

place while the previous data is

displayed and eliminates the need

to blank the display while loading

data.

Pixel Map

In a 4-character display, the

160-bits are arranged as 20

Table 1. Register Truth Table

Function

CLK

Select Dot Register

Not Rising

↓

Load Dot Register

DIN = HIGH LED = "ON"

↑

DIN = LOW

LED = "OFF"

Copy Data from Dot Register to Dot Latch

Select Control Register

Not Rising

↓

Load Control Register[1][3]

↑

Latch Data to Control Word[2]

↑

Notes:

1. BIT D0 of Control Word 1 must have been previously set to Low for serial mode or High for simultaneous mode.

2. Selection of Control Word 1 or Control Word 0 is set by D7 of the Control Shift Register. The unselected control word retains its

previous value.

3. Control Word data is loaded Most Significant Bit (D7) first.

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