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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) 26 Page - Microchip Technology |
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DSPIC30F датащи(HTML) 26 Page - Microchip Technology |
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26 / 248 page  dsPIC30F DS70083G-page 24 Preliminary 2004 Microchip Technology Inc. 2.3 Instruction Flow There are 8 types of instruction flows: 1. Normal one-word, one-cycle instructions: these instructions take one effective cycle to execute as shown in Figure 2-2. FIGURE 2-2: INSTRUCTION PIPELINE FLOW: 1-WORD, 1-CYCLE 2. One-word, two-cycle (or three-cycle) instruc- tions that are flow control instructions: these instructions include the relative branches, rela- tive call, skips and returns. When an instruction changes the PC (other than to increment it), the pipelined fetch is discarded. This causes the instruction to take two effective cycles to exe- cute as shown in Figure 2-3. Some instructions that change program flow require 3 cycles, such as the RETURN, RETFIE and RETLW instruc- tions, and instructions that skip over 2-word instructions. FIGURE 2-3: INSTRUCTION PIPELINE FLOW: 1-WORD, 2-CYCLE T CY0TCY1TCY2TCY3TCY4TCY5 1. MOV.b #0x55,W0 Fetch 1 Execute 1 2. MOV.b #0x35,W1 Fetch 2 Execute 2 3. ADD.b W0,W1,W2 Fetch 3 Execute 3 T CY0TCY1TCY2TCY3TCY4TCY5 1. MOV #0x55,W0 Fetch 1 Execute 1 2. BTSC W1,#3 Fetch 2 Execute 2 Skip Taken 3. ADD W0,W1,W2 Fetch 3 Flush 4. BRA SUB_1 Fetch 4 Execute 4 5. SUB W0,W1,W3 Fetch 5 Flush 6. Instruction @ address SUB_1 Fetch SUB_1 |
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