HT45F65 datasheet(93/231 Pages) HOLTEK

93 / 231 page

Rev. 1.60

9�

�ove��e� �� 01�

Rev. 1.60

�ove��e� �� 01�

HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

Programming Considerations

TheTMCounterRegistersandtheCapture/CompareCCRAandCCRBregisters,beingeither10-

bitor16-bit,allhavealowandhighbytestructure.Thehighbytescanbedirectlyaccessed,butas

thelowbytescanonlybeaccessedviaaninternal8-bitbuffer,readingorwritingtotheseregister

pairsmustbecarriedoutinaspecificway.Theimportantpointtonoteisthatdatatransfertoand

fromthe8-bitbufferanditsrelatedlowbyteonlytakesplacewhenawriteorreadoperationtoits

correspondinghighbyteisexecuted.

TM C ount er R eg is te r (R ead on ly )

TM xD L

TM xD H

TM xA L

TM xA H

8- bi t Bu ff er

TM CCRB R eg is te r (R ead/ W ri te )

Da ta

Bu s

TM xB L

TM xB H

TM C CR A Re gi st er ( R ead/ W ri te )

Thefollowingstepsshowthereadandwriteprocedures:

• WritingDatatoCCRBorCCRA

♦

Step1.WritedatatoLowByteTMxALorTMxBL

–Notethatheredataisonlywrittentothe8-bitbuffer.

♦

Step2.WritedatatoHighByteTMxAHorTMxBH

–Heredataiswrittendirectlytothehighbyteregistersandsimultaneouslydataislatched

fromthe8-bitbuffertotheLowByteregisters.

• ReadingDatafromtheCounterRegistersandCCRBorCCRA

♦

Step1.ReaddatafromtheHighByteTMxDH,TMxAHorTMxBH

–HeredataisreaddirectlyfromtheHighByteregistersandsimultaneouslydataislatched

fromtheLowByteregisterintothe8-bitbuffer.

♦

Step2.ReaddatafromtheLowByteTMxDL,TMxALorTMxBL

–Thisstepreadsdatafromthe8-bitbuffer.

AstheCCRAandCCRBregistersareimplementedinthewayshowninthefollowingdiagramand

accessingtheseregisterpairsiscarriedoutinaspecificwaydescribedabove,itisrecommendedto

usethe"MOV"instructiontoaccesstheCCRAandCCRBlowbyteregisters,namedTMxALand

TMxBL,usingthefollowingaccessprocedures.AccessingtheCCRAorCCRBlowbyteregisters

withoutfollowingtheseaccessprocedureswillresultinunpredictablevalues.

HT45F65 Datasheet(PDF) 93 Page - Holtek Semiconductor Inc

HT45F65 Datasheet(HTML) 93 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL