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HT45F75 Datasheet(PDF) 66 Page - Holtek Semiconductor Inc

Part # HT45F75
Description  Body Fat Scale Flash MCU
PDF  190 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F75 Datasheet(HTML) 66 Page - Holtek Semiconductor Inc

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HT45F75
Body Fat Scale Flash MCU
HT45F75
Body Fat Scale Flash MCU
Input/Output Ports
HoltekmicrocontrollersofferconsiderableflexibilityontheirI/Oports.Withtheinputoroutput
designationofeverypinfullyunderuserprogramcontrol,pull-highselectionsforallportsand
wake-upselectionsoncertainpins,theuserisprovidedwithanI/Ostructuretomeettheneedsofa
widerangeofapplicationpossibilities.
Thedeviceprovidesbidirectionalinput/outputlineslabeledwithportnamesPA~PD.TheseI/O
portsaremappedtotheRAMDataMemorywithspecificaddressesasshownintheSpecialPurpose
DataMemorytable.AlloftheseI/Oportscanbeusedforinputandoutputoperations.Forinput
operation,theseportsarenon-latching,whichmeanstheinputsmustbereadyattheT2risingedge
ofinstruction“MOVA,[m]”,wheremdenotestheportaddress.Foroutputoperation,allthedatais
latchedandremainsunchangeduntiltheoutputlatchisrewritten.
Register
Name
Bit
7
6
5
4
3
2
1
0
PAWU
D7
D�
D5
D�
D3
D�
D1
D0
PAPU
D7
D�
D5
D�
D3
D�
D1
D0
PA
D7
D�
D5
D�
D3
D�
D1
D0
PAC
D7
D�
D5
D�
D3
D�
D1
D0
PBPU
D7
D�
D5
D�
D3
D�
D1
D0
PB
D7
D�
D5
D�
D3
D�
D1
D0
PBC
D7
D�
D5
D�
D3
D�
D1
D0
PCPU
D7
D�
D5
D�
D3
D�
D1
D0
PC
D7
D�
D5
D�
D3
D�
D1
D0
PCC
D7
D�
D5
D�
D3
D�
D1
D0
PDPU
—
—
—
—
—
D�
D1
D0
PD
—
—
—
—
—
D�
D1
D0
PDC
—
—
—
—
—
D�
D1
D0
I/O Register List
Pull-high Resistors
Manyproductapplicationsrequirepull-highresistorsfortheirswitchinputsusuallyrequiringthe
useofanexternalresistor.Toeliminatetheneedfortheseexternalresistors,allI/Opins,when
configuredasaninputhavethecapabilityofbeingconnectedtoaninternalpull-highresistor.These
pull-highresistorsareselectedusingregistersPAPU~PDPU,andareimplementedusingweak
PMOStransistors.
PAPU Register
Bit
7
6
5
4
3
2
1
0
Na�e
D7
D�
D5
D�
D3
D�
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit7~0
PortAbit7~bit0Pull-highControl
0:Disable
1:Enable



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