PIC16C55X(A)
FIGURE 10-3: CLKOUT AND I/O TIMING
Q1
Q2
Q3
Q4
OSC1
11
10
22
23
CLKOUT
13
14
12
16
18
19
I/O Pin
(input)
15
17
I/O Pin
new value
old value
(output)
20, 21
Note: All tests must be do with specified capacitance loads (Figure 10-1) 50 pF on I/O pins and CLKOUT
TABLE 10-3: CLKOUT AND I/O TIMING REQUIREMENTS
Parameter # Sym
Characteristic
Min
Typ†
Max
Units
10*
TosH2ckL
OSC1↑ to CLKOUT↓ (Note1)
—
—
75
—
200
400
ns
ns
11*
TosH2ckH
—
—
75
—
ns
ns
OSC1↑ to CLKOUT↑ (Note1)
200
400
12*
13*
TckR
TckF
—
—
35
—
100
200
ns
ns
CLKOUT rise time (Note1)
CLKOUT fall time (Note1)
—
—
35
—
100
200
ns
ns
14*
15*
TckL2ioV
TioV2ckH
—
—
20
ns
CLKOUT ↓ to Port out valid (Note1)
Port in valid before CLKOUT ↑ (Note1)
Tosc +200 ns
Tosc +400 ns
—
—
—
—
ns
ns
16*
17*
TckH2ioI
TosH2ioV
0
—
—
ns
Port in hold after CLKOUT ↑ (Note1)
OSC1↑ (Q1 cycle) to Port out valid
—
—
50
150
300
ns
ns
18*
TosH2ioI
OSC1↑ (Q2 cycle) to Port input invalid (I/O in hold
time)
100
200
—
—
—
—
ns
ns
19*
20*
TioV2osH
TioR
Port input valid to OSC1↑ (I/O in setup time)
0
—
—
ns
Port output rise time
—
—
10
—
40
80
ns
ns
21*
22*
23
TioF
Tinp
Trbp
Port output fall time
—
—
10
—
40
80
ns
ns
RB0/INT pin high or low time
RB<7:4> change interrupt high or low time
25
40
—
—
—
—
ns
ns
Tcy
—
—
ns
*
†
These parameters are characterized but not tested
Data in "Typ" column is at 5.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested.
Note 1: Measurements are taken in RC Mode where CLKOUT output is 4 x TOSC
1997 Microchip Technology Inc.
Preliminary
DS40143B-page 75
MICROCHIP [ MICROCHIP ]
