HT1632 データシートの表示（PDF） - Holtek Semiconductor

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HT1632

32x8 & 24x16 LED Driver

Holtek Semiconductor 

HT1632

Blinker

The HT1632 has display blinking capabilities. The blink

function generates all LED blinking. The blink rates is

0.25ms LED on and 0.25ms LED off for one blinking pe-

riod . This blinking function can be effectively performed

by setting the BLINK ON or BLINK OFF command.

Command Format

The S/W setting can configure the HT1632. There are

two mode commands to configure the HT1632 resources

and to transfer the LED display data. The configuration

mode of the HT1632 is knows as the command

mode,with a command mode ID of 1 0 0. The command

mode consists of a system configuration command, a

system frequency selection command, a LED configura-

tion command, and an operating command. The data

mode, on the other hand, includes READ, WRITE, and

READ-MODIFY-WRITE operations.

The following are the data mode ID and the command

mode ID:

Operation

Mode

ID

READ

Data

110

WRITE

Data

101

READ-MODIFY-WRITE

Data

101

COMMAND

Command

100

The mode command should be issued before the data

or command is transferred. If successive commands

have been issued, the command mode ID, namely 1 0 0,

can be omitted. While the system is operating in the

non-successive command or the non-successive ad-

dress data mode, the CS pin should be set to ²1² and the

previous operation mode will be reset also. Once the CS

pin returns to ²0², a new operation mode ID should be is-

sued first.

Interfacing

Only four lines are required to interface to the HT1632.

The CS line is used to initialise the serial interface circuit

and to terminate the communication between the host

controller and the HT1632. If the CS pin is set to 1, the

data and command issued between the host controller

and the HT1632 are first disabled and then initialised.

Before issuing a mode command or mode switching, a

high level pulse is required to initialise the serial inter-

face of the HT1632. The DATA line is the serial data in-

put/output line. Data to be read or written or commands

to be written have to be passed through the DATA line.

The RD line is the READ clock input. Data in the RAM is

clocked out on the falling edge of the RD signal, and the

clocked out data will then appear on the DATA line. It is

recommended that the host controller reads in the cor-

rect data during the interval between the rising edge and

the next falling edge of the RD signal. The WR line is the

WRITE clock input. The data, address, and command

on the DATA line are all clocked into the HT1632 on the

rising edge of the WR signal.

LE D

T u rn O n

0 .2 5 m s

T u rn O ff

0 .2 5 m s

B lin k O n

Example of Waveform for Blinker

B lin k O ff

Rev. 1.00

8

October 2, 2007

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