PIC16F877-20L Datasheet, PDF (163/218 Pages) Microchip Technology – 28/40-Pin 8-Bit CMOS FLASH Microcontrollers

FIGURE 15-7:
CLKOUT AND I/O TIMING
OSC1
Q4
Q1
10
CLKOUT
I/O Pin
(Input)
13
14
17
I/O Pin
(Output)
Old Value
20, 21
Note: Refer to Figure 15-5 for load conditions.
Q2
19 ¹⁸
15
PIC16F87X
Q3
11
12
16
New Value
TABLE 15-2: CLKOUT AND I/O TIMING REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Typ†
Max Units Conditions
10* TosH2ckL OSC1 to CLKOUT
—
75
200
ns (Note 1)
11* TosH2ck OSC1 to CLKOUT
H
—
75
200
ns (Note 1)
12*
TckR CLKOUT rise time
—
35
100
ns (Note 1)
13*
TckF CLKOUT fall time
—
35
100
ns (Note 1)
14* TckL2ioV CLKOUT  to Port out valid
—
— 0.5TCY + 20 ns (Note 1)
15* TioV2ckH Port in valid before CLKOUT 
TOSC + 200 —
—
ns (Note 1)
16* TckH2ioI Port in hold after CLKOUT 
0
—
—
ns (Note 1)
17* TosH2ioV OSC1 (Q1 cycle) to
Port out valid
—
100
255
ns
18* TosH2ioI OSC1 (Q2 cycle) to
Standard (F)
Port input invalid (I/O in _{Extended (LF)}
hold time)
100
—
—
ns
200
—
—
ns
19* TioV2osH Port input valid to OSC1(I/O in setup time)
0
—
—
ns
20*
TioR Port output rise time
Standard (F)
—
10
40
ns
Extended (LF)
—
—
145
ns
21*
TioF Port output fall time
Standard (F)
—
10
40
ns
Extended (LF)
—
—
145
ns
22††* Tinp INT pin high or low time
TCY
—
—
ns
23††* Trbp RB7:RB4 change INT high or low time
TCY
—
—
ns
* 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.
 1998-2013 Microchip Technology Inc.
DS30292D-page 163