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HTG13J0 Datasheet(PDF) 8 Page - Holtek Semiconductor Inc |
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HTG13J0 Datasheet(HTML) 8 Page - Holtek Semiconductor Inc |
8 / 30 page HT13J0 8 May19,1999 Mode ProgramCounter PA3 PC11 PC10 PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 Initial reset 1 0 0 0 00 00 00 0 0 0 Internal interrupt PA3 0 0 0 0 0 0 0 0 0 1 0 0 External interrupt PA3 0 0 0 0 0 0 0 0 1 0 0 0 Jump,call instruction PA3 PC11 PC10 PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 Conditional branch PA3 @ PC10 PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 Returnfrom subroutine PA3 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2 S1 S0 Programcounter Notes:PC11~PC0:Instructioncodebits @:PC11keepsthecurrentvalue S11~S0:Stackregisterbits PA3:Bankvaluebits FunctionalDescription Programcounter - PC The bit 13 of program memory is controlled by PA3 which can change the address of the pro- gram. There are two banks of the program memory, which are selected by PA3, every bank is 4KB ROM. The instruction "UT PA,A" is used to change the value of PA3. Then, low or high 4K ROM is selected accordingly. All instruc- tions are not effective on crossing bank, unless thevalueofPA3ischangedinadvance. The 12-bit program counter (PC) controls the sequence in which the instructions stored in program ROM are executed and its contents specifyamaximumof4096addresses. After accessing a memory word to fetch an in- struction code, the contents of the program counter are incremented by 1 or 2, then the pro- gram counter will point to the memory word containingthenextinstructioncode. When executing the jump instruction (JMP, JNZ, JC,JTMR...), subroutine call, internal in- terrupt, external interrupt or return from sub- routine, the PC manipulates the program transfer by loading the address corresponding toeachinstruction. |
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Similar Description - HTG13J0 |
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