PIC16F87 Datasheet, PDF (180/214 Pages) Microchip Technology – 18/20/28-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology

PIC16F87/88
FIGURE 18-5:
OSC1
CLKO AND I/O TIMING
Q4
Q1
10
CLKO
I/O Pin
(Input)
13
14
17
I/O Pin
(Output)
Old Value
20, 21
Note: Refer to Figure 18-3 for load conditions.
Q2
19 ¹⁸
15
Q3
11
12
16
New Value
TABLE 18-4: CLKO AND I/O TIMING REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Typ†
Max
Units Conditions
10*
TosH2ckL OSC1↑ to CLKO↓
—
75
200
ns (Note 1)
11*
TosH2ckH OSC1↑ to CLKO↑
—
75
200
ns (Note 1)
12*
TckR
CLKO rise time
—
35
100
ns (Note 1)
13*
TckF
CLKO fall time
—
35
100
ns (Note 1)
14*
TckL2ioV CLKO ↓ to Port out valid
—
— 0.5 TCY + 20 ns (Note 1)
15*
TioV2ckH Port in valid before CLKO ↑
TOSC + 200 —
—
ns (Note 1)
16*
TckH2ioI Port in hold after CLKO ↑
0
—
—
ns (Note 1)
17*
TosH2ioV OSC1↑ (Q1 cycle) to Port out valid
—
100
255
ns
18*
TosH2ioI OSC1↑ (Q2 cycle) to
PIC16F87/88
Port input invalid (I/O in _PIC16LF87/88
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
PIC16F87/88
—
10
40
ns
PIC16LF87/88
—
—
145
ns
21*
TIOF
Port output fall time
PIC16F87/88
—
10
40
ns
PIC16LF87/88
—
—
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 CLKO output is 4 x TOSC.
DS30487B-page 178
Preliminary
 2003 Microchip Technology Inc.