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PIC17C752-08/CL Datasheet(PDF) 197 Page - Microchip Technology |
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PIC17C752-08/CL Datasheet(HTML) 197 Page - Microchip Technology |
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197 / 328 page  © 1998 Microchip Technology Inc. DS30289A-page 197 PIC17C7XX 18.2 Q Cycle Activity Each instruction cycle (TCY) is comprised of four Q cycles (Q1-Q4). The Q cycle is the same as the device oscillator cycle (TOSC). The Q cycles provide the tim- ing/designation for the Decode, Read, Process Data, Write etc., of each instruction cycle. The following dia- gram shows the relationship of the Q cycles to the instruction cycle. The four Q cycles that make up an instruction cycle (TCY) can be generalized as: Q1: Instruction Decode Cycle or forced No operation Q2: Instruction Read Cycle or No operation Q3: Process the Data Q4: Instruction Write Cycle or No operation Each instruction will show the detailed Q cycle opera- tion for the instruction. FIGURE 18-2: Q CYCLE ACTIVITY Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 TCY1TCY2TCY3 Tosc |
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