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HT16L21 데이터시트(PDF) 20 Page - Holtek Semiconductor Inc

부품명 HT16L21
상세설명  RAM Mapping 32x4 LCD Driver
PDF  36 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT16L21 데이터시트(HTML) 20 Page - Holtek Semiconductor Inc

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Rev. 1.00
20
November 16, 2011
HT16L21
Display RAM Page Write Operation
AfteraSTARTconditiontheslaveaddresswiththeR/Wbitisplacedonthebusfollowedwithadisplaydatainput
commandbyteandthespecifieddisplayRAMRegisterAddressofwhichthecontentsarewrittentotheinternal
addresspointer.Thedatatobewrittentothememorywillbetransmittednextandthentheinternaladdresspointer
willbeincrementedby1toindicatethenextmemoryaddresslocationafterthereceptionofanacknowledgeclock
pulse.Aftertheinternaladdresspointreachesthemaximummemoryaddress,theaddresspointerwillberesetto
00H.
Slave Address
ACK
Write
ACK
S
0
1
1
1
0
0
0
0
ACK
2nd
ACK
Data byte
P
D7 D6 D5 D4 D3 D2 D1 D0
Nth data
Data byte
D7 D6 D5 D4 D3 D2 D1 D0
2nd data
ACK
ACK
Data byte
D7 D6 D5 D4 D3 D2 D1 D0
1st data
ACK
Register Address byte
Command byte
1st
0
0
0
0
0
0
0
1
A0
A1
A2
A3
X
X
X
X
I2C Interface N Bytes Display RAM Data Write Operation
SP1
SP0
Maximum Memory Address
0
X
0FH
1
0
0DH
1
1
0BH
I2C Interface Display RAM Read Operation
Inthismode,themasterreadstheHT16L21dataaftersettingtheslaveaddress.FollowingtheR/Wbit(="0")
isanacknowledgebit,acommandbyteandtheregisteraddressbytewhichiswrittentotheinternaladdress
pointer.AfterthestartaddressoftheReadOperationhasbeenconfigured,anotherSTARTconditionandtheslave
addresstransferredonthebusfollowedbytheR/Wbit(="1").ThentheMSBofthedatawhichwasaddressedis
transmittedfirstontheI2Cbus.Theaddresspointerisonlyincrementedby1afterthereceptionofanacknowledge
clock.ThatmeansthatifthedeviceisconfiguredtotransmitthedataattheaddressofAN+1,themasterwillread
andacknowledgethetransferrednewdatabyteandtheaddresspointerisincrementedtoAN+2.Aftertheinternal
addresspointerreachesthemaximummemoryaddress,theaddresspointerwillberesetto00H.
ThiscycleofreadingconsecutiveaddresseswillcontinueuntilthemastersendsaSTOPcondition.
ACK
Write
ACK
P
Slave Address
S 0 1 1 1 0 0 0 0
Data byte
NACK
D7 D6 D5 D4 D3 D2 D1 D0
1st data
Data byte
ACK
P
D7 D6 D5 D4 D3 D2 D1 D0
Nth data
Data byte
D7 D6 D5 D4 D3 D2 D1 D0
2nd data
ACK
ACK
ACK
Slave Address
Read
S 0 1 1 1 0 0 0 1
ACK
Register Address byte
Command byte
1st
2nd
A0
A1
A2
A3
X
X
X
X
0
0
0
0
0
0
0
1
0
I2C Interface N Bytes Display RAM Data Read Operation



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