Holtek HT66F30 - Special Vectors; Look-�P Table

Rev. 2.50 30 June 22, 2017 Rev. 2.50 31 June 22, 2017
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
Special Vectors
WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.Thelocation
0000Hisreservedforusebythedeviceresetforprograminitialisation.Afteradeviceresetis
initiated,theprogramwilljumptothislocationandbeginexecution.
Look-up Table
AnylocationwithintheProgramMemorycanbedenedasalook-uptablewhereprogrammerscan
storexeddata.Tousethelook-uptable,thetablepointermustrstbesetupbyplacingtheaddress
ofthelookupdatatoberetrievedinthetablepointerregister,TBLPandTBHP.Theseregisters
denethetotaladdressofthelook-uptable.
Aftersettingupthetablepointer,thetabledatacanberetrievedfromtheProgramMemoryusing
the"TABRD[m]"or"TABRDL[m]"instructions,respectively.Whentheinstructionisexecuted,
thelowerordertablebytefromtheProgramMemorywillbetransferredtotheuserdefined
DataMemoryregister[m]asspecifiedintheinstruction.Thehigherordertabledatabytefrom
theProgramMemorywillbetransferredtotheTBLHspecialregister.Anyunusedbitsinthis
transferredhigherorderbytewillbereadas"0".
Theaccompanyingdiagramillustratestheaddressingdataowofthelook-uptable.
R egister T BLH
User S electe d
R egister
High Byte Low B yte
TBLP R egister
Data
A ddress
14~16 bits
 
Last page or
TBHP R egis te r