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PIC16F84A Datasheet(PDF) 28 Page - Microchip Technology |
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PIC16F84A Datasheet(HTML) 28 Page - Microchip Technology |
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28 / 124 page  PIC16F8X DS30430C-page 28 © 1998 Microchip Technology Inc. FIGURE 6-3: TMR0 TIMING: INTERNAL CLOCK/PRESCALE 1:2 FIGURE 6-4: TMR0 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 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 = 3.25Tcy, where Tcy = instruction cycle time. 3: CLKOUT is available only in RC oscillator mode. 4 Interrupt Latency(2) 4: The timer clock (after the synchronizer circuit) which increments the timer from FFh to 00h immediately sets the T0IF bit. The TMR0 register will roll over 3 Tosc cycles later. |
Similar Part No. - PIC16F84A |
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Similar Description - PIC16F84A |
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