HT16K33 datasheet(13/47 Pages) HOLTEK

13 / 47 page

Rev. 1.10

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Rev. 1.10

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HT16K33

RAM Mapping 16*8 LED Controller Driver with keyscan

System Setup Register

The system setup register configures system operation or standby for the HT16K33.

● The internal system oscillator is enabled when the ‘S’ bit of the system setup register is set to “1”.

● The internal system clock is disabled and the device will enter the standby mode when the “S” bit

of the system setup register is set to “0”.

● Before the standby mode command is sent, it is strongly recommended to read the key data first.

● The system setup register command is shown as follows:

Name

Command / Address / Data

Option

Description

Def.

D15 D14 D13 D12 D11 D10 D9 D8

S�stem

set

{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)

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ROW/INT Set Register

The ROW/INT setup register can be set to either an LED Row output, or an INT logic output.

● The INT output is selected when the ROW/INT set register is set to “1”.

● The ROW output is selected when the ROW/INT set register is set to “0”.

● The INT logic output can be configured as an INT output level controlled by the keyscan circuitry

and controlled through the 2-wire interface.

● The INT output is active-low when the ‘act’ bit of ROW/INT set register is set to “0”.

● The INT output is active-high when the ‘act’ bit of ROW/INT set t register is set to “1”.

● The ROW/INT setup register command is shown as follows:

Name

Command / Address / Data

Option

Description

Def.

D15 D14 D13 D12 D11 D10 D9 D8

row/int

set

X act row/

int

{act�

row/int }

Write

onl�

● Defines INT/ROW output pin

select and INT pin output active

level status.

● {X 0}: INT/ROW output pin is

set to ROW driver output.

● {0� 1}: INT/ROW output pin is

set to INT output� active low.

● {1� 1}: INT/ROW output pin is

set to INT output� active high.

A0H

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