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HT16L21 Datasheet(PDF) 19 Page - Holtek Semiconductor Inc

Part # HT16L21
Description  RAM Mapping 32x4 LCD Driver
PDF  36 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT16L21 Datasheet(HTML) 19 Page - Holtek Semiconductor Inc

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Rev. 1.00
19
November 16, 2011
HT16L21
I2C Interface Write Operation
Byte Write Operation
• Single Command Type
ASingleCommandwriteoperationrequiresaSTARTcondition,aslaveaddresswithanR/Wbit,acommand
byteandaSTOPconditionforasinglecommandwriteoperation.
Slave Address
ACK
Write
Command byte
ACK
S
0
1
1
1
0
0
0
0
1st
BIT0
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
P
I2C Single Command Type Write Operation
• Compound Command Type
ACompoundCommandwriteoperationrequiresaSTARTcondition,aslaveaddresswithanR/Wbit,a
commandbyte,acommandsettingbyteandaSTOPconditionforacompoundcommandwriteoperation.
Slave Address
ACK
Write
Command byte
ACK
S
0
1
1
1
0
0
0
0
1st
BIT0
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
Command setting
ACK
P
2nd
BIT0
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
I2C Compound Command Type Write Operation
• Display RAM Single Data Byte
AdisplayRAMdatabytewriteoperationrequiresaSTARTcondition,aslaveaddresswithanR/Wbit,a
displaydatainputcommandbyte,avalidRegisterAddressbyte,aDatabyteandaSTOPcondition.
Slave Address
ACK
Write
Command byte
ACK
S 0 1 1 1 0 0 0 0
Data byte
ACK
P
D7 D6 D5 D4 D3 D2 D1 D0
Register Address byte
ACK
2nd
1st
0
0
0
0
0
0
0
1
A0
A1
A2
A3
X
X
X
X
I2C Display RAM Single Data Byte Write Operation



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