PIC18CXX2
FIGURE 21-6: CLKOUT AND I/O TIMING
Q1
Q2
Q3
Q4
OSC1
11
10
CLKOUT
13
12
16
19
18
14
I/O Pin
(input)
15
17
I/O Pin
(output)
new value
old value
20, 21
Note: Refer to Figure 21-4 for load conditions.
TABLE 21-6: CLKOUT AND I/O TIMING REQUIREMENTS
Param.
Symbol
Characteristic
Min
Typ
Max
Units Conditions
No.
(1)
10
TosH2ckL OSC1↑ to CLKOUT↓
TosH2ckH OSC1↑ to CLKOUT↑
—
75
75
35
35
—
—
—
50
—
—
200
200
100
100
ns
(1)
11
12
13
14
15
16
17
18
18A
—
ns
(1)
TckR
TckF
CLKOUT rise time
CLKOUT fall time
—
ns
(1)
—
ns
(1)
TckL2ioV CLKOUT ↓ to Port out valid
—
0.5TCY + 20 ns
(1)
(1)
TioV2ckH Port in valid before CLKOUT ↑
TckH2ioI Port in hold after CLKOUT ↑
TosH2ioV OSC1↑ (Q1 cycle) to Port out valid
TosH2ioI OSC1↑ (Q2 cycle) to PIC18CXXX
0.25TCY + 25
—
—
ns
ns
ns
ns
ns
0
—
150
—
100
200
Port input invalid
(I/O in hold time)
PIC18LCXXX
—
19
TioV2osH Port input valid to OSC1↑
0
—
—
ns
(I/O in setup time)
20
TioR
TioF
Port output rise time
Port output fall time
INT pin high or low time
PIC18CXXX
PIC18LCXXX
PIC18CXXX
PIC18LCXXX
—
—
10
—
10
—
—
—
25
60
25
60
—
—
ns
ns
ns
ns
ns
ns
ns
20A
21
—
21A
22††
23††
24††
—
TINP
TRBP
TRCP
TCY
TCY
20
RB7:RB4 change INT high or low time
RC7:RC4 change INT high or low time
††These parameters are asynchronous events not related to any internal clock edges.
Note 1: Measurements are taken in RC Mode where CLKOUT output is 4 x TOSC.
7/99 Microchip Technology Inc.
Preliminary
DS39026B-page 255
MICROCHIP [ MICROCHIP ]
