
2009 Microchip Technology Inc.
DS40044G-page 143
PIC16F627A/628A/648A
17.5
Timing Parameter Symbology
The timing parameter symbols have been created with one of the following formats:
FIGURE 17-3:
LOAD CONDITIONS
1. TppS2ppS
2. TppS
T
F
Frequency
T
Time
Lowercase subscripts (pp) and their meanings:
pp
ck
CLKOUT
osc
OSC1
io
I/O port
t0
T0CKI
mc
MCLR
Uppercase letters and their meanings:
S
FFall
P
Period
HHigh
R
Rise
I
Invalid (High-impedance)
V
Valid
L
Low
Z
High-Impedance
VDD/2
CL
RL
Pin
VSS
CL
RL =464
Ω
CL = 50 pF for all pins except OSC2
15 pF for OSC2 output
Load Condition 1
Load Condition 2