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HT48R068B датащи(PDF) 64 Page - Holtek Semiconductor Inc

номер детали HT48R068B
подробное описание детали  Enhanced I/O 8-Bit OTP MCU
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R068B датащи(HTML) 64 Page - Holtek Semiconductor Inc

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HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
Thefollowingdiagramillustratesthewaveformsassociatedwiththe7+1modePWMoperation.It
isimportanttonotehowthesinglePWMcycleissubdividedinto2individualmodulationcycles,
numbered0and1andhowtheACvalueisrelatedtothePWMvalue.
f SY S /2
PW M
[P WM ] =1 00
[P WM ] =1 01
PW M
[P WM ] =1 02
PW M
[P WM ] =1 03
PW M
PW M m odul at i on per i od : 128 /f SY S
50/ 12 8
51/ 12 8
51/ 12 8
52/ 12 8
50/ 12 8
50/ 12 8
51/ 12 8
51/ 12 8
50/ 12 8
51/ 12 8
51/ 12 8
52/ 12 8
M odul at i on cycl e 0
PW M cycl e : 256/ f SY S
M odul at i on cycl e 1
M odul at i on cycl e 0
7+1 PWM Mode
PW M Re gi st er
( 7+ 1) M od e
b7
b0
AC va lu e
DC va lu e
PWM Register for 7+1 Mode
PWM Output Control
ThePWMoutputsarepin-sharedwiththeI/OpinsPA4/PB5,PC2,PC3andPD1.Tooperateasa
PWMoutputandnotasanI/Opin,thecorrectbitsmustbesetintheCTRL0andCTRL2register.
AzerovaluemustalsobewrittentothecorrespondingbitintheI/OportcontrolregisterPAC.4,
PCC.2andPCC.3toensurethatthecorrespondingPWMoutputpinissetupasanoutput.After
thesetwoinitialstepshavebeencarriedout,andofcourseaftertherequiredPWMvaluehasbeen
writtenintothePWMnregister,writingahighvaluetothecorrespondingbitintheoutputdata
registerPA.4,PC.2andPC.3willenablethePWMdatatoappearonthepin.Writingazerovalue
willdisablethePWMoutputfunctionandforcetheoutputlow.Inthisway,thePortdataoutput
registerscanbeusedasanon/offcontrolforthePWMfunction.NotethatiftheCTRL0andCTRL2
registershaveselectedthePWMfunction,butahighvaluehasbeenwrittentoitscorrespondingbit
inthePAC/PBC,PCCorPDCcontrolregistertoconfigurethepinasaninput,thenthepincanstill
functionasanormalinputline,withpull-highresistoroptions.
PWM Programming Example
The following sample program shows how the PWM0 output is setup and controlled.
mov a,64h
; setup PWM value of decimal 100
mov pwm0,a
set ctrl0.5
; select the 7+1 PWM mode
set ctrl0.3
; select pin PA4 to have a PWM function
clr pac.4
; setup pin PA4 as an output
set pa.4
; enable the PWM output
: :
clr pa.4
; disable the PWM output_ pin
; PA4 forced low


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