PIC16C505T-04/SL View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'PIC16C505T-04/SL' PDF : 85 Pages View PDF
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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