PIC16F87X
FIGURE 15-6: CLKOUT AND I/O TIMING
Q1
Q2
Q3
Q4
OSC1
11
10
CLKOUT
13
14
12
18
19
16
I/O Pin
(input)
15
17
I/O Pin
new value
old value
(output)
20, 21
Note: Refer to Figure 15-4 for load conditions.
TABLE 15-2: CLKOUT AND I/O TIMING REQUIREMENTS
Param Sym
No.
Characteristic
Min
Typ†
Max
Units Conditions
10*
11*
12*
13*
14*
15*
16*
17*
TosH2ckL OSC1↑ to CLKOUT↓
TosH2ckH OSC1↑ to CLKOUT↑
—
75
75
35
35
—
200
200
ns
ns
ns
ns
ns
ns
ns
ns
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
—
TckR
TckF
CLKOUT rise time
CLKOUT fall time
—
100
—
100
TckL2ioV CLKOUT ↓ to Port out valid
TioV2ckH Port in valid before CLKOUT ↑
TckH2ioI Port in hold after CLKOUT ↑
—
0.5TCY + 20
—
TOSC + 200
—
0
—
—
TosH2ioV OSC1↑ (Q1 cycle) to
—
100
255
Port out valid
18*
TosH2ioI OSC1↑ (Q2 cycle) to
Port input invalid (I/O in
hold time)
Standard (F)
Extended (LF)
100
200
—
—
—
—
ns
ns
19*
20*
TioV2osH Port input valid to OSC1↑ (I/O in setup time)
0
—
—
10
—
10
—
—
—
—
40
ns
ns
ns
ns
ns
ns
ns
TioR
TioF
Port output rise time
Port output fall time
INT pin high or low time
Standard (F)
Extended (LF)
Standard (F)
Extended (LF)
—
145
40
21*
—
—
145
—
22††* Tinp
23††* Trbp
TCY
TCY
RB7:RB4 change INT high or low time
—
Legend:
*
These parameters are characterized but not tested.
†
Data in "Typ" column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
†† 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.
DS30292B-page 160
1999 Microchip Technology Inc.
ETC [ ETC ]
