HT16K33 datasheet(33/47 Pages) HOLTEK

33 / 47 page

Rev. 1.10

�a� 1�� 011

Rev. 1.10

�a� 1�� 011

HT16K33

RAM Mapping 16*8 LED Controller Driver with keyscan

Command Summary

Name

Command / Address

Option

Description

Def.

D15 D14 D13 D12 D11 D10 D9 D8

Displa�

data

Address

pointer

A3 A� A1 A0 {A0~A3}

R/W

● Five bits of immediate data� bits A0 to A3�

are transferred to the data pointer to define

one of sixteen displa� RA� addresses.

● If the Displa� data register address (An)

is 0X00h ~ 0X0Fh� after reaching the

memor� location 0X0Fh� the pointer will

reset to 0X00h

00H

S�stem

setup

{S}

Write onl�

Defines internal system oscillator on/off

● {0}:Turn off S�stem oscillator (standb�

mode)

● {1}:Turn on S�stem oscillator (normal

operation mode)

�0H

Ke� data

Address

pointer

K� K1 K0 {K0~K�}

Read onl�

● Three bits of immediate data� bits K0 to

K�� are transferred to the data pointer to

define one of six key data RAM addresses.

● It is strongl� recommended that the ke�

data RA� of address 0x40H~0x45H

should be read continuousl� and in one

operation� so the ke� data RA� of address

should be started at 0x40H onl�.

● If the Ke� data register address (An) is

0X40h ~ 0X45h� after reaching the memor�

location 0X45h� the pointer will reset to

0X40h

40H

INT flag

Address

pointer

0 Read onl�

Defines the INT flag address, Read INT flag

status.

Interrupt flag signal output. When an� ke�

matrix ke� is pressed� after the completion of

two key scan cycles, this int flag bit goes to a

high level and remains at a high level until all

ke� data has been read�

�0H

Displa�

setup

B1 B0

{D}

Write onl�

Defines Display on/off status.

● {0}: Displa� off

● {1}: Displa� on

80H

{B1�B0}

Write onl�

Defines the blinking frequency

● {0�0} = Blinking OFF

● {0�1} = �HZ

● {1�0} = 1HZ

● {1�1} = 0.5HZ

Note: If programmed command data is not defined, the function will not be affected.

HT16K33 Datasheet(PDF) 33 Page - Holtek Semiconductor Inc

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