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HT45R4U Arkusz danych(PDF) 20 Page - Holtek Semiconductor Inc

Numer części HT45R4U
Szczegółowy opis  TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD
Download  105 Pages
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Producent  HOLTEK [Holtek Semiconductor Inc]
Strona internetowa  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R4U Arkusz danych(HTML) 20 Page - Holtek Semiconductor Inc

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HT45R4U
TinyPowerTM A/D Type
e-Banking ASSP OTP MCU with LCD
Table Program Example
Theaccompanyingexampleshowshowthetablepointerandtabledataisdefinedandretrievedfrom
thedevice.Thisexampleusesrawtabledatalocatedinthelastpagewhichisstoredthereusingthe
ORGstatement.ThevalueatthisORGstatementis"3F00H"whichreferstothestartaddressofthe
lastpagewithinthe16KProgramMemoryoftheHT45R4Udevice.Thetablepointerissetuphere
tohaveaninitialvalueof"06H".Thiswillensurethatthefirstdatareadfromthedatatablewillbe
attheProgramMemoryaddress"3F06H"or6locationsafterthestartofthelastpage.Notethatthe
valueforthetablepointerisreferencedtothefirstaddressofthepresentpageifthe"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
rombank 1 code1
ds .section 'data'
tempreg1 db ?
; temporary register#1
tempreg2 db ?
; temporary register#2
:
:
code0 .section 'code'
mov a,06h
; initialise table pointer - note that this address is referenced
mov tblp,a
; to the last page or the page that tbhp pointed
mov a,01fh
; initialise high table pointer
mov tbhp,a
; it is not necessary to set tbhp if executing tabrdl
:
:
tabrd tempreg1
; transfers value in table referenced by table pointer
; to tempregl
; data at prog.memory address 1F06H transferred to
; tempreg1 and TBLH
dec tblp
; reduce value of table pointer by one
tabrdl tempreg2
; transfers value in table referenced by table pointer
; to tempreg2
; data at prog.memory address 1F05H transferred to
; tempreg2 and TBLH
; in this example the data 1AH is transferred to
; tempreg1 and data 0FH to tempreg2
; the value 00H will be transferred to the high byte
; register TBLH
:
:
code1 .section 'code'
org 1F00h
; sets initial address of last page
dc 00Ah,00Bh,00Ch,00Dh,00Eh,00Fh,01Ah,01Bh


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