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HT45F75 Datasheet(PDF) 135 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) 135 Page - Holtek Semiconductor Inc

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Rev. 1.10
13�
De�e��e� 1�� �01�
Rev. 1.10
135
De�e��e� 1�� �01�
HT45F75
Body Fat Scale Flash MCU
HT45F75
Body Fat Scale Flash MCU
Bit0
TEIE:TransmitterEmptyinterruptenablecontrol
0:Transmitteremptyinterruptisdisabled
1:Transmitteremptyinterruptisenabled
Thisbitenablesordisablesthetransmitteremptyinterrupt.Ifthisbitisequalto"1"
andwhenthetransmitteremptyflagTXIFisset,duetoatransmitteremptycondition,
theUARTinterruptrequestflagwillbeset.Ifthisbitisequalto"0",theUART
interruptrequestflagwillnotbeinfluencedbytheconditionoftheTXIFflag.
TXRRXR Register
Bit
7
6
5
4
3
2
1
0
Na�e
TXRXD7 TXRXD� TXRXD5 TXRXD� TXRXD3 TXRXD� TXRXD1 TXRXD0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
x
x
x
x
x
x
x
x
“x” unknown
Bit7~0
TXRXD7~TXRXD0:UARTTransmit/ReceiveDatabit7~bit0
BRG Register
Bit
7
6
5
4
3
2
1
0
Na�e
BRGD7
BRGD�
BRGD5
BRGD�
BRGD3
BRGD�
BRGD1
BRGD0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
x
x
x
x
x
x
x
x
“x” unknown
Bit7~0
BRGD7~BRGD0:BaudRatevalues
ByprogrammingtheBRGHbitinUCR2Registerwhichallowsselectionofthe
relatedformuladescribedaboveandprogrammingtherequiredvalueintheBRG
register,therequiredbaudratecanbesetup.
Note:Baudrate=fSYS/[64×(N+1)]ifBRGH=0.
Baudrate=fSYS/[16×(N+1)]ifBRGH=1.
Baud Rate Generator
Tosetupthespeedoftheserialdatacommunication,theUARTfunctioncontainsitsowndedicated
baudrategenerator.Thebaudrateiscontrolledbyitsowninternalfreerunning8-bittimer,the
periodofwhichisdeterminedbytwofactors.Thefirstoftheseisthevalueplacedinthebaudrate
registerBRGandthesecondisthevalueoftheBRGHbitwiththecontrolregisterUCR2.The
BRGHbitdecidesifthebaudrategeneratoristobeusedinahighspeedmodeorlowspeedmode,
whichinturndeterminestheformulathatisusedtocalculatethebaudrate.ThevalueNintheBRG
registerwhichisusedinthefollowingbaudratecalculationformuladeterminesthedivisionfactor.
NotethatNisthedecimalvalueplacedintheBRGregisterandhasarangeofbetween0and255.
UCR2 BRGH Bit
0
1
Baud Rate (BR)
fSYS / [�� (N+1)]
fSYS / [1� (N+1)]
ByprogrammingtheBRGHbitwhichallowsselectionoftherelatedformulaandprogrammingthe
requiredvalueintheBRGregister,therequiredbaudratecanbesetup.Notethatbecausetheactual
baudrateisdeterminedusingadiscretevalue,N,placedintheBRGregister,therewillbeanerror
associatedbetweentheactualandrequestedvalue.ThefollowingexampleshowshowtheBRG
registervalueNandtheerrorvaluecanbecalculated.



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