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PIC16C925-S/CL Datasheet(PDF) 44 Page - Microchip Technology |
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PIC16C925-S/CL Datasheet(HTML) 44 Page - Microchip Technology |
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44 / 182 page ![]() PIC16C925/926 DS39544A-page 42 Preliminary 2001 Microchip Technology Inc. FIGURE 5-2: TIMER0 TIMING: INTERNAL CLOCK/NO PRESCALE FIGURE 5-3: TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2 FIGURE 5-4: 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 Fetched TMR0 PC PC+1 PC+2 PC+3 PC+4 PC+5 PC+6 T0 T0+1 T0+2 NT0 NT0 NT0 NT0+1 NT0+2 T0 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 + 1 Read TMR0 reads NT0 + 2 Instruction Executed PC+6 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 Fetched 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 Executed 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) Timer0 TMR0IF bit (INTCON<2>) FEh GIE bit (INTCON<7>) INSTRUCTION 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: Interrupt flag bit TMR0IF is sampled here (every Q1). 2: Interrupt latency = 4TCY where TCY = instruction cycle time. 3: CLKOUT is available only in RC oscillator mode. FLOW OSC1 |
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