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HT9B92 数据表(PDF) 13 Page - Holtek Semiconductor Inc

部件名 HT9B92
功能描述  RAM Mapping 36횞4 LCD Driver
PDF  25 Pages
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制造商  HOLTEK [Holtek Semiconductor Inc]
网页  http://www.holtek.com
标志 HOLTEK - Holtek Semiconductor Inc

HT9B92 数据表(HTML) 13 Page - Holtek Semiconductor Inc

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Rev. 1.20
13
November 25, 2015
HT9B92
Blinking Function
Thedevicecontainsversatileblinkingcapabilities.
Thewholedisplaycanbeblinkedatfrequencies
selectedbytheBlinkingFrequencycommand.The
blinkingfrequencyisasubdividedratioofthesystem
frequency.Theratiobetweenthesystemoscillator
andblinkingfrequenciesdependsontheblinking
modeinwhichthedeviceisoperating,asshownin
thefollowingtable:
Blinking Mode
Blinking frequency (Hz)
0
Blink off
1
0.5
2
1
3
2
Frame Frequency
Thedeviceprovidesfourframefrequenciesselected
withtheFrameFrequencycommandknownas80Hz,
71Hz,64Hzand53Hzrespectively.
Mode
Frame frequency (Hz) @ VDD=3.3V
0
80
1
71
2
64
3
53
I2C Serial Interface
I2C Operation
ThedevicesupportsI2Cserialinterface.TheI2Cbus
isforbidirectional,two-linecommunicationbetween
differentICsormodules.Thetwolinesareaserial
dataline,SDA,andaserialclockline,SCL.Both
linesareconnectedtothepositivesupplyviapull-up
resistors.Whenthebusisfree,bothlinesarehigh.
Devicesconnectedtothebusmusthaveopen-drain
oropen-collectoroutputstoimplementawired-or
function.Datatransferisinitiatedonlywhenthebus
isnotbusy.
Data Validity
ThedataontheSDAlinemustbestableduringthe
highperiodoftheserialclock.Thehighorlowstate
ofthedatalinecanonlychangewhentheclocksignal
ontheSCLlineisLowasshowninthediagram.
SDA
SCL
Datalinestable;
Datavalid
Changeofdata
allowed
START and STOP Conditions
• AhightolowtransitionontheSDAlinewhileSCL
ishighdefinesaSTARTcondition.
• AlowtohightransitionontheSDAlinewhileSCL
ishighdefinesaSTOPcondition.
• STARTandSTOPconditionsarealwaysgenerated
bythemaster.Thebusisconsideredtobebusy
aftertheSTARTcondition.Thebusisconsidered
tobefreeagainacertaintimeaftertheSTOP
condition.
• ThebusstaysbusyifarepeatedSTART(Sr)is
generatedinsteadofaSTOPcondition.Insome
respects,theSTART(S)andrepeatedSTART(Sr)
conditionsarefunctionallyidentical.
P
S
SDA
SCL
SDA
SCL
START condition
STOP condition
Byte Format
EverybyteputontheSDAlinemustbe8-bitlong.
Thenumberofbytesthatcanbetransmittedper
transferisunrestricted.Eachbytehastobefollowed
byanacknowledgebit.Dataistransferredwiththe
mostsignificantbit,MSB,first.
S
or
Sr
P
or
Sr
SDA
SCL
1
2
7
8
9
ACK
1
2
3-8
9
ACK
P
Sr



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