Datasheet

PIC18F6585/8585/6680/8680
DS30491D-page 434  2003-2013 Microchip Technology Inc.
TABLE 27-12: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param.
No.
Symbol Characteristic Min Max Units Conditions
40 T
T0H T0CKI High Pulse Width No prescaler 0.5 TCY + 20 — ns
With prescaler 10 — ns
41 T
T0L T0CKI Low Pulse Width No prescaler 0.5 TCY + 20 — ns
With prescaler 10 — ns
42 T
T0P T0CKI Period No prescaler TCY + 10 — ns
With prescaler Greater of:
20 n
S or TCY + 40
N
— ns N = prescale
value
(1, 2, 4,..., 256)
45 T
T1H T1CKI
High Time
Synchronous, no prescaler 0.5 TCY + 20 — ns
Synchronous,
with prescaler
PIC18FXX8X 10 — ns
PIC18LFXX8X 25 — ns
Asynchronous PIC18FXX8X 30 — ns
PIC18LFXX8X 50 — ns
46 T
T1L T1CKI Low
Time
Synchronous, no prescaler 0.5 TCY + 5 — ns
Synchronous,
with prescaler
PIC18FXX8X 10 — ns
PIC18LFXX8X 25 — ns
Asynchronous PIC18FXX8X 30 — ns
PIC18LFXX8X TBD TBD ns
47 T
T1P T1CKI
Input
Period
Synchronous Greater of:
20 n
S or TCY + 40
N
— ns N = prescale
value
(1, 2, 4, 8)
Asynchronous 60 — ns
F
T1 T1CKI Oscillator Input Frequency Range DC 50 kHz
48 T
CKE2TMRI Delay from External T1CKI Clock Edge to
Timer Increment
2 TOSC 7 TOSC —
18F8680.book Page 434 Tuesday, January 29, 2013 1:32 PM