PIC12CE519T-04 查看數據表（PDF） - Microchip Technology

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PIC12CE519T-04

8-Pin, 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC12C5XX

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 GPIO

PC + 1

MOVF GPIO,W

PC + 2

NOP

PC + 3

NOP

GP5:GP0

Instruction

executed

Port pin

written here

Port pin

sampled here

MOVWF GPIO

(Write to

GPIO)

MOVF GPIO,W

(Read

GPIO)

NOP

This example shows a write to GPIO followed

by a read from GPIO.

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.

DS40139E-page 23

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