ETIC 2230 Guía de usuario descargar pdf (Pagina 60)

Rev. 1.10 60 November 14, 2014 Rev. 1.10 61 November 14, 2014

HT66FW2230

Wireless Charger A/D Flash 8-Bit MCU

PB2/TP1_0

PB2 Out put F unctio n

PBS03~P BS02

PA7/TC K1

Outp ut

TC K I nput

 

  

PB3/TP1_1

PB3 Out put F unctio n

PBS05~P BS04

Outp ut

TM1 Function Pin Control Block Diagram

Note:1.TheI/OregisterdatabitsshownareusedforTMoutputinversioncontrol.

2.IntheCaptureInputMode,theTMpincontrolregistermustneverenablemorethanoneTMinput.

Programming Considerations

TheTMCounterRegisters,theCapture/CompareCCRAregister,beingboth10-bit,allhavealowand

highbytestructure.Thehighbytescanbedirectlyaccessed,butasthelowbytescanonlybeaccessed

viaaninternal8-bitbuffer,readingorwritingtotheseregisterpairsmustbecarriedoutinaspecic

way.Theimportantpointtonoteisthatdatatransfertoandfromthe8-bitbufferanditsrelatedlow

byteonlytakesplacewhenawriteorreadoperationtoitscorrespondinghighbyteisexecuted.

AstheCCRAregisterisimplementedinthewayshowninthefollowingdiagramandaccessing

theseregisterpairsiscarriedoutinaspecicwaydescribedabove,itisrecommendedtousethe

“MOV”instructiontoaccesstheCCRAlowbyteregisters,namedTMxAL,usingthefollowing

accessprocedures.AccessingtheCCRAlowbyteregisterwithoutfollowingtheseaccessprocedures

willresultinunpredictablevalues.

    

  

  

  

  

 

    





Thefollowingstepsshowthereadandwriteprocedures:

• WritingDatatoCCRA



♦

Step1.WritedatatoLowByteTMxAL

-notethatheredataisonlywrittentothe8-bitbuffer.



♦

Step2.WritedatatoHighByteTMxAH

-heredataiswrittendirectlytothehighbyteregistersandsimultaneouslydataislatchedfrom

the8-bitbuffertotheLowByteregisters.

• ReadingDatafromtheCounterRegistersandCCRA



♦

Step1.ReaddatafromtheHighByteTMxDH,TMxAH

-heredataisreaddirectlyfromtheHighByteregistersandsimultaneouslydataislatched

fromtheLowByteregisterintothe8-bitbuffer.



♦

Step2.ReaddatafromtheLowByteTMxDLorTMxAL

-thisstepreadsdatafromthe8-bitbuffer.

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