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PIC16F628 Datasheet(PDF) 46 Page - Microchip Technology |
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PIC16F628 Datasheet(HTML) 46 Page - Microchip Technology |
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46 / 160 page ![]() PIC16F62X DS40300B-page 46 Preliminary © 1999 Microchip Technology Inc. FIGURE 6-3: TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2 FIGURE 6-4: TIMER0 INTERRUPT TIMING PC-1 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 PC (Program Counter) Instruction Fetch TMR0 PC PC+1 PC+2 PC+3 PC+4 PC+5 PC+6 T0 NT0+1 MOVWF TMR0 MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W Write TMR0 executed Read TMR0 reads NT0 Read TMR0 reads NT0 Read TMR0 reads NT0 Read TMR0 reads NT0 Read TMR0 reads NT0 + 1 T0+1 NT0 Instruction Execute Q2 Q1 Q3 Q4 Q2 Q1 Q3 Q4 Q2 Q1 Q3 Q4 Q2 Q1 Q3 Q4 Q2 Q1 Q3 Q4 1 1 OSC1 CLKOUT(3) TMR0 timer T0IF bit (INTCON<2>) FEh GIE bit (INTCON<7>) INSTRUCTION FLOW PC Instruction fetched PC PC +1 PC +1 0004h 0005h Instruction executed Inst (PC) Inst (PC-1) Inst (PC+1) Inst (PC) Inst (0004h) Inst (0005h) Inst (0004h) Dummy cycle Dummy cycle FFh 00h 01h 02h Note 1: T0IF interrupt flag is sampled here (every Q1). 2: Interrupt latency = 3TCY, where TCY = instruction cycle time. 3: CLKOUT is available only in ER and INTRC (with clockout) oscillator modes. Interrupt Latency Time |
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