PIC16LC505T-20E/SL Ver la hoja de datos (PDF) - Microchip Technology

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Fabricante

PIC16LC505T-20E/SL

14-Pin, 8-Bit CMOS Microcontroller

Microchip Technology 

PIC16C505

FIGURE 5-2: SUCCESSIVE I/O OPERATION

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Instruction

fetched

PC

MOVWF PORTB

PC + 1

MOVF PORTB,W

PC + 2

NOP

PC + 3

NOP

RB<5:0>

Instruction

executed

Port pin

written here

Port pin

sampled here

MOVWF PORTB MOVF PORTB,W

NOP

(Write to PORTB) (Read PORTB)

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.

© 1999 Microchip Technology Inc.

DS40192C-page 21

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