RFPIC12C509AG Datasheet, PDF (27/104 Pages) Microchip Technology – 18/20-Pin 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter

rfPIC12C509AG/509AF
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 MOVF GPIO,W
NOP
(Write to
(Read
GPIO)
GPIO)
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.
© 2001 Microchip Technology Inc.
Preliminary
DS70031A-page 25