HT66F007 datasheet(19/131 Pages) HOLTEK

19 / 131 page

Rev. 1.41

April 11, 2017

Rev. 1.41

April 11, 2017

HT66F007/HT66F008

Cost-Effective A/D Flash MCU with EEPROM

HT66F007/HT66F008

Cost-Effective A/D Flash MCU with EEPROM

Theaccompanyingdiagramillustratestheaddressingdataflowofthelook-uptable.

Last Page or

TBHP Register

TBLP Register

Data

16 bits

Program Memory

User Selected

High Byte

Low Byte

Table Program Example

Thefollowingexampleshowshowthetablepointerandtabledataisdefinedandretrievedfromthe

microcontroller.ThisexampleusesrawtabledatalocatedintheProgramMemorywhichisstored

thereusingtheORGstatement.ThevalueatthisORGstatementis“700H”whichreferstothestart

addressofthelastpagewithinthe2KwordsProgramMemoryoftheHT66F007.Thetablepointeris

setupheretohaveaninitialvalueof“06H”.Thiswillensurethatthefirstdatareadfromthedatatable

willbeattheProgramMemoryaddress“706H”or6locationsafterthestartofthelastpage.Note

thatthevalueforthetablepointerisreferencedtothefirstaddressofthepresentpageifthe“TABRD

[m]”instructionisbeingused.Thehighbyteofthetabledatawhichinthiscaseisequaltozerowillbe

transferredtotheTBLHregisterautomaticallywhenthe“TABRD[m]”instructionisexecuted.

BecausetheTBLHregisterisaread-onlyregisterandcannotberestored,careshouldbetaken

toensureitsprotectionifboththemainroutineandInterruptServiceRoutineusetableread

instructions.Ifusingthetablereadinstructions,theInterruptServiceRoutinesmaychangethe

valueoftheTBLHandsubsequentlycauseerrorsifusedagainbythemainroutine.Asaruleitis

recommendedthatsimultaneoususeofthetablereadinstructionsshouldbeavoided.However,in

situationswheresimultaneoususecannotbeavoided,theinterruptsshouldbedisabledpriortothe

executionofanymainroutinetable-readinstructions.Notethatalltablerelatedinstructionsrequire

twoinstructioncyclestocompletetheiroperation.

Table Read Program Example

tempreg1 db ?

; temporary register #1

tempreg2 db ?

; temporary register #2

mov a,06h

; initialise low table pointer - note that this address is referenced

mov tblp,a

; to the last page or present page

mov a,07h

; initialise high table pointer

mov tbhp,a

tabrd tempreg1

; transfers value in table referenced by table pointer data at program

; memory address “706H” transferred to tempreg1 and TBLH

dec tblp

; reduce value of table pointer by one

tabrd tempreg2

; transfers value in table referenced by table pointer data at program

; memory address “705H” transferred to tempreg2 and TBLH in this

; example the data “1AH” is transferred to tempreg1 and data “0FH” to

; register tempreg2

org 700h

; sets initial address of program memory

dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh

HT66F007 Datasheet(PDF) 19 Page - Holtek Semiconductor Inc

HT66F007 Datasheet(HTML) 19 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