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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DSPIC30F датащи(PDF) 28 Page - Microchip Technology |
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DSPIC30F датащи(HTML) 28 Page - Microchip Technology |
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28 / 248 page  dsPIC30F DS70083G-page 26 Preliminary 2004 Microchip Technology Inc. 6. Two-word instructions for DO: in these instruc- tions, the fetch after the instruction contains an address offset. This address offset is added to the first instruction address to generate the last loop instruction address. Therefore, these instructions require 2 cycles as shown in Figure 2-7. FIGURE 2-7: INSTRUCTION PIPELINE FLOW: 2-WORD, 2-CYCLE DO, DOW 7. Instructions that are subjected to a stall due to a data dependency between the X RAGU and X WAGU: an additional cycle is inserted to resolve the resource conflict as shown in Figure 2-7. Instruction stalls caused by data dependencies are further discussed in Section 4.0. FIGURE 2-8: INSTRUCTION PIPELINE FLOW: 1-WORD, 2-CYCLE WITH INSTRUCTION STALL 8. Interrupt recognition execution: refer to Section 6.0 for details on interrupts. T CY0TCY1TCY2TCY3TCY4 1. PUSH DOEND Fetch 1 Execute 1 2. DO LABEL,#COUNT Fetch 2L NOP 2a. Second Word Fetch 2H Execute 2 3. 1st Instruction of Loop Fetch 3 Execute 3 T CY0TCY1TCY2TCY3TCY4TCY5 1. MOV.b W0,[W1] Fetch 1 Execute 1 2. MOV.b [W1],PORTB Fetch 2 NOP 2a. Stall (NOP) Stall Execute 2 3. MOV.b W0,PORTB Fetch 3 Execute 3 |
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