PIC16C67-10I/P データシートの表示（PDF） - Microchip Technology
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PIC16C67-10I/P Datasheet PDF : 336 Pages
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PIC16C6X
FIGURE 7-3: TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2
PC
(Program
Counter)
Instruction
Fetch
TMR0
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-1
PC
PC+1
PC+2
PC+3
PC+4
PC+5
MOVWF TMR0 MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W
PC+6
T0
T0+1
NT0
NT0+1
T0
Instruction
Execute
Write TMR0
executed
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0 + 1
FIGURE 7-4: TMR0 INTERRUPT TIMING
OSC1
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
CLKOUT(3)
Timer0
FEh
FFh
00h
01h
02h
1
1
T0IF bit
(INTCON<2>)
GIE bit
(INTCON<7>)
INSTRUCTION
FLOW
PC
Instruction
fetched
Instruction
executed
PC
Inst (PC)
Inst (PC-1)
PC +1
Inst (PC+1)
Inst (PC)
PC +1
Dummy cycle
0004h
Inst (0004h)
Dummy cycle
0005h
Inst (0005h)
Inst (0004h)
Note 1: Interrupt flag bit T0IF is sampled here (every Q1).
2: Interrupt latency = 4Tcy where Tcy = instruction cycle time.
3: CLKOUT is available only in RC oscillator mode.
DS30234D-page 66
© 1997 Microchip Technology Inc.
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