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HT48R002 Fiches technique(PDF) 37 Page - Holtek Semiconductor Inc

No de pièce HT48R002
Description  Cost-Effective I/O 8-Bit OTP MCU
Download  71 Pages
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Fabricant  HOLTEK [Holtek Semiconductor Inc]
Site Internet  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R002 Fiches technique(HTML) 37 Page - Holtek Semiconductor Inc

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Rev. 1.11
36
April 11, 2017
Rev. 1.11
37
April 11, 2017
HT48R002/HT48R003
Cost-Effective I/O 8-Bit OTP MCU
HT48R002/HT48R003
Cost-Effective I/O 8-Bit OTP MCU
Wa ke - up f unc ti on
M
U
X
Re ad D at a R egi st er
Co nt ro l Bi t
Da ta B us
Wr it e C ont ro l R egi st er
Ch ip R es et
Re ad C on tr ol R egi st er
Wr it e Da ta R eg is te r
Da ta B it
D
Q
CK
S
Q
D
Q
CK
S
Q
PA 7/ RE S
S yst em W ak e- up
RE S
PA7 NMOS Input/Output Port
Programming Considerations
Withintheuserprogram,oneofthethingsfirsttoconsiderisportinitialization.Afterareset,all
oftheI/Odataandportcontrolregisterswillbesettohigh.ThismeansthatallI/Opinswillbe
defaultedtoaninputstate,thelevelofwhichdependsontheotherconnectedcircuitryandwhether
pull-highselectionshavebeenchosen.Iftheportcontrolregistersarethenprogrammedtosetsome
pinsasoutputs,theseoutputpinswillhaveaninitialhighoutputvalueunlesstheassociatedport
dataregistersarefirstprogrammed.Selectingwhichpinsareinputsandwhichareoutputscanbe
achievedbyte-widebyloadingthecorrectvaluesintotheappropriateportcontrolregisterorby
programmingindividualbitsintheportcontrolregisterusingthe“SET[m].i”and“CLR[m].i”
instructions.Notethatwhenusingthesebitcontrolinstructions,aread-modify-writeoperationtakes
place.Themicrocontrollermustfirstreadinthedataontheentireport,modifyittotherequirednew
bitvaluesandthenrewritethisdatabacktotheoutputports.
T1
T2
T3
T4
T1
T2
T3
T4
S yst em C lo ck
Po rt D at a
Re ad f ro m Po rt
Wr it e to P or t
Read Modify Write Timing
PinsPA0~PA2,PA5eachhavewake-upfunctions,selectedviathePAWUregister.Whenthedevice
isintheSleepMode,variousmethodsareavailabletowakethedeviceup.Oneoftheseisahighto
lowtransitionofanypins.SingleormultiplepinsonPortAcanbesettohavethisfunction.


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