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HT67F488 Datasheet(PDF) 119 Page - Holtek Semiconductor Inc

Part # HT67F488
Description  TinyPowerTM A/D Flash MCU with LCD & EEPROM
PDF  171 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT67F488 Datasheet(HTML) 119 Page - Holtek Semiconductor Inc

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Rev. 1.60
119
�ove��e� ��� �016
HT67F488/HT67F489
TinyPowerTM A/D Flash MCU with LCD & EEPROM
TXR/RXR Register
Bit
7
6
5
4
3
2
1
0
�a�e
TXRX7
TXRX6
TXRX5
TXRX4
TXRX3
TXRX�
TXRX1
TXRX0
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
TXRX7~TXRX0:UARTTransmit/ReceiveDatabit7~bit0
BRG Register
Bit
7
6
5
4
3
2
1
0
�a�e
BRG7
BRG6
BRG5
BRG4
BRG3
BRG�
BRG1
BRG0
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
BRG7~BRG0: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 / [64 (�+1)]
fSYS / [16 (�+1)]
ByprogrammingtheBRGHbitwhichallowsselectionoftherelatedformulaandprogrammingthe
requiredvalueintheBRGregister,therequiredbaudratecanbesetup.Notethatbecausetheactual
baudrateisdeterminedusingadiscretevalue,N,placedintheBRGregister,therewillbeanerror
associatedbetweentheactualandrequestedvalue.ThefollowingexampleshowshowtheBRG
registervalueNandtheerrorvaluecanbecalculated.



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