PIC18F6585 Datasheet, PDF (436/496 Pages) Microchip Technology – 64/68/80-Pin High-Performance, 64-Kbyte Enhanced Flash Microcontrollers with ECAN Module

PIC18F6585/8585/6680/8680
TABLE 27-12: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param.
No.
Symbol
Characteristic
Min
Max Units Conditions
40
TT0H
T0CKI High Pulse Width No prescaler
0.5 TCY + 20
— ns
With prescaler
10
— ns
41
TT0L
T0CKI Low Pulse Width No prescaler
0.5 TCY + 20
— ns
With prescaler
10
— ns
42
TT0P
T0CKI Period
No prescaler
TCY + 10
— ns
With prescaler Greater of:
—
20 nS or TCY + 40
N
ns N = prescale
value
(1, 2, 4,..., 256)
45
TT1H
T1CKI
Synchronous, no prescaler
High Time _{Synchronous, PIC18FXX8X}
with prescaler _PIC18LFXX8X
0.5 TCY + 20
10
25
— ns
— ns
— ns
Asynchronous PIC18FXX8X
30
— ns
PIC18LFXX8X
50
— ns
46
TT1L
T1CKI Low Synchronous, no prescaler
Time
Synchronous, PIC18FXX8X
with prescaler _PIC18LFXX8X
0.5 TCY + 5
10
25
— ns
— ns
— ns
Asynchronous PIC18FXX8X
30
— ns
PIC18LFXX8X
TBD
TBD ns
47
TT1P
T1CKI
Input
Period
Synchronous
Greater of:
—
20 nS or TCY + 40
N
ns N = prescale
value
(1, 2, 4, 8)
Asynchronous
60
— ns
FT1
T1CKI Oscillator Input Frequency Range
DC
50 kHz
48
TCKE2TMRI Delay from External T1CKI Clock Edge to
Timer Increment
2 TOSC
7 TOSC —
DS30491C-page 434
 2004 Microchip Technology Inc.