HT16L21 datasheet(25/36 Pages) HOLTEK

25 / 36 page

Rev. 1.00

November 16, 2011

HT16L21

Display Data Input Command

ThiscommandsendsdatafromMCUtothememoryMAPoftheHT16L21device.

Function

Byte (MSB)

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1

(LSB)

Bit0

Note

R/W Def

Display Data

Input/output

Command

1st

Write operation

—

Read operation for 3-wire

SPI interface used only.

—

Address pointer 2nd

A2 A1

A0 Display data start address

of memory map

00H

Note:

SP1

SP0

Maximum Memory Address

0FH

0DH

0BH

● Power on status: The address is set to 00H.

● If the programmed command is not defined, the function will not be affected.

System Mode Command

Thiscommandcontrolstheinternalsystemoscillatoron/offanddisplayon/off.

Function

Byte (MSB)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1 (LSB)

Bit0 Note R/W

Def

System mode setting

command

1st

—

System oscillator and

Display on/off Setting

2nd

—

00H

Note:

Bit

Internal System Oscillator

LCD Display

off

● Power on status: Display off and disable the internal system oscillator.

● If the programmed command is not defined, the function will not be affected.

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