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PIC16LC505-20/P Datasheet(PDF) 21 Page - Microchip Technology |
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PIC16LC505-20/P Datasheet(HTML) 21 Page - Microchip Technology |
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21 / 80 page  © 1998 Microchip Technology Inc. Preliminary DS40192A-page 21 PIC16C505 FIGURE 5-2: SUCCESSIVE I/O OPERATION PC PC + 1 PC + 2 PC + 3 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Instruction fetched RB5:RB0 MOVWF PORTB NOP Port pin sampled here NOP MOVF PORTB,W Instruction executed MOVWF PORTB (Write to PORTB) NOP MOVF PORTB,W This example shows a write to PORTB followed by a read from PORTB. Data setup time = (0.25 TCY – TPD) where: TCY = instruction cycle. TPD = propagation delay Therefore, at higher clock frequencies, a write followed by a read may be problematic. (Read PORTB) Port pin written here |
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