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HT48R068B Datenblatt(PDF) 45 Page - Holtek Semiconductor Inc

Teilenummer HT48R068B
Bauteilbeschribung  Enhanced I/O 8-Bit OTP MCU
Download  118 Pages
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Hersteller  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R068B Datenblatt(HTML) 45 Page - Holtek Semiconductor Inc

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Rev. 1.30
44
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HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
Register
Power-on
Reset
RES or LVR
Reset
(Normal
Operation)
RES or LVR
Reset
(Idle/Sleep)
WDT Time-out
(Normal
Operation)
WDT Time-out
(Idle/Sleep)
DAL
● ● 0000 –––– 0000 –––– 0000 –––– 0000 –––– ���� ––––
DAH
● ● 0000 0000 0000 0000 0000 0000 0000 0000 ���� ����
VOL
● ● 0000 –––– 0000 –––– 0000 –––– 0000 –––– ���� ––––
LVDC
● ● ––00 –––– ––00 –––– ––00 –––– ––00 –––– ––�� ––––
Input/Output Ports
HoltekmicrocontrollersofferconsiderableflexibilityontheirI/Oports.Mostpinscanhaveeitheran
inputoroutputdesignationunderuserprogramcontrol.Additionally,astherearepull-highresistors
andwake-upsoftwareconfigurations,theuserisprovidedwithanI/Ostructuretomeettheneedsof
awiderangeofapplicationpossibilities.
Forinputoperation,theseportsarenon-latching,whichmeanstheinputsmustbereadyattheT2
risingedgeofinstruction"MOVA,[m]",wheremdenotestheportaddress.Foroutputoperation,all
thedataislatchedandremainsunchangeduntiltheoutputlatchisrewritten.
Pull-high Resistors
Manyproductapplicationsrequirepull-highresistorsfortheirswitchinputsusuallyrequiringtheuse
ofanexternalresistor.Toeliminatetheneedfortheseexternalresistors,whenconfiguredasaninput
havethecapabilityofbeingconnectedtoaninternalpull-highresistor.Thesepull-highresistorsare
selectableviaaregisterknownasPAPU~PHPUlocatedintheDataMemory.Thepull-highresistors
areimplementedusingweakPMOStransistors.NotethatpinPA7doesnothaveapull-highresistor
selection.
Port A Wake-up
IftheHALTinstructionisexecuted,thedevicewillentertheIdle/SleepMode,wherethesystem
clockwillstopresultinginpowerbeingconserved,afeaturethatisimportantforbatteryandother
low-powerapplications.
Variousmethodsexisttowake-upthemicrocontroller,oneofwhichistochangethelogiccondition
ononeofthePA0~PA7pinsfromhightolow.AfteraHALTinstructionforcesthemicrocontroller
intoenteringtheIdle/SleepMode,theprocessorwillremainidleorinalow-powerstateuntilthe
logicconditionoftheselectedwake-uppinonPortAchangesfromhightolow.Thisfunctionis
especiallysuitableforapplicationsthatcanbewokenupviaexternalswitches.NotethatpinsPA0
toPA7canbeselectedindividuallytohavethiswake-upfeatureusinganinternalregisterknownas
PAWK,locatedintheDataMemory.


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