Datasheet

PIC18F2331/2431/4331/4431
DS39616D-page 348  2010 Microchip Technology Inc.
FIGURE 26-6: CLKO AND I/O TIMING
TABLE 26-7: 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 T
CY + 20 ns (Note 1)
15 TioV2ckH Port In Valid before CLKO  0.25 T
CY + 25 — — ns (Note 1)
16 TckH2ioI Port In Hold after CLKO  0——ns(Note 1)
17 TosH2ioV OSC1  (Q1 cycle) to Port Out Valid — 50 150 ns
18 TosH2ioI OSC1  (Q2 cycle) to
Port Input Invalid
(I/O in hold time)
PIC18FXX31 100 — — ns
18A PIC18LFXX31 200 — — ns
19 TioV2osH Port Input Valid to OSC1 (I/O in setup
time)
0——ns
20 TioR Port Output Rise Time PIC18FXX31 — 10 25 ns
20A PIC18LFXX31 — — 60 ns
21 TioF Port Output Fall Time PIC18FXX31 — 10 25 ns
21A PIC18LFXX31 — — 60 ns
22† T
INP INTx Pin High or Low Time TCY ——ns
23† T
RBP RB<7:4> Change INTx High or Low Time TCY ——ns
† 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.
OSC1
CLKO
I/O Pin
(Input)
I/O Pin
(Output)
Q4
Q1
Q2 Q3
10
13
14
17
20, 21
19
18
15
11
12
16
Old Value
New Value