HT68F002 datasheet(59/119 Pages) HOLTEK

59 / 119 page

Rev. 1.41

April 11, 2017

Rev. 1.41

April 11, 2017

HT68F002/HT68F0025/HT68F003

Cost-Effective Flash MCU with EEPROM

HT68F002/HT68F0025/HT68F003

Cost-Effective Flash MCU with EEPROM

PTM

PTP1

PTCK1

Capture Input

TCK Input

Output

PTP1I

PTP1B

Inverting Output

PTM Function Pin Control Block Diagram

Programming Considerations

TheTMCounterRegistersandtheCapture/CompareCCRAregister,andCCRPregisterpairfor

PeriodicTimerModule,allhavealowandhighbytestructure.Thehighbytescanbedirectly

accessed,butasthelowbytescanonlybeaccessedviaaninternal8-bitbuffer,readingorwriting

totheseregisterpairsmustbecarriedoutinaspecificway.Theimportantpointtonoteisthatdata

transfertoandfromthe8-bitbufferanditsrelatedlowbyteonlytakesplacewhenawriteorread

operationtoitscorrespondinghighbyteisexecuted.

AstheCCRAregisterandCCRPregistersareimplementedinthewayshowninthefollowing

diagramandaccessingtheregisteriscarriedoutCCRPlowbyteregisterusingthefollowing

accessprocedures.AccessingtheCCRAorCCRPlowbyteregisterwithoutfollowingtheseaccess

procedureswillresultinunpredictablevalues.

Data Bus

8-bit Buffer

STM0DH

STM0DL

STM0AH

STM0AL

STM CCRA Register (Read/Write)

STM Counter Register (Read only)

Data Bus

8-bit Buffer

PTM1DH

PTM1DL

PTM1AH

PTM1AL

PTM CCRA Register (Read/Write)

PTM Counter Register (Read only)

PTM1RPH

PTM1RPL

PTM CCRP Register (Read/Write)

Thefollowingstepsshowthereadandwriteprocedures:

• WritingDatatoCCRAorPTMCCRP

♦

Step1.WritedatatoLowByteSTM0ALorPTM1RPL

– notethatheredataisonlywrittentothe8-bitbuffer.

♦

Step2.WritedatatoHighByteSTM0AHorPTM1RPH

– heredataiswrittendirectlytothehighbyteregistersandsimultaneouslydataislatched

fromthe8-bitbuffertotheLowByteregisters.

• ReadingDatafromtheCounterRegistersandCCRAorPTMCCRP

♦

Step1.ReaddatafromtheHighByteSTM0DH,STM0AHorPTM1RPH

– heredataisreaddirectlyfromtheHighByteregistersandsimultaneouslydataislatched

fromtheLowByteregisterintothe8-bitbuffer.

♦

Step2.ReaddatafromtheLowByteSTM0DL,STM0ALorPTM1RPL

– thisstepreadsdatafromthe8-bitbuffer.

HT68F002 Datasheet(PDF) 59 Page - Holtek Semiconductor Inc

HT68F002 Datasheet(HTML) 59 Page - Holtek Semiconductor Inc

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