PIC16F87XA Datasheet, PDF (185/234 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers

PIC16F87XA
FIGURE 17-5:
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 17-3 for load conditions.
Q2
19 ¹⁸
15
Q3
11
12
16
New Value
TABLE 17-4: 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 Port Input Standard (F)
100
—
—
ns
Invalid (I/O in hold time)
Extended (LF)
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 CLKO output is 4 x TOSC.
 2003 Microchip Technology Inc.
DS39582B-page 183