Datasheet

© 2007 Microchip Technology Inc. DS39599G-page 333
PIC18F2220/2320/4220/4320
TABLE 26-11: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
FIGURE 26-11: CAPTURE/COMPARE/PWM TIMINGS (ALL CCP MODULES)
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 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 ns or T
CY + 40
N
—nsN = prescale
value
(1, 2, 4,..., 256)
45 TT1H T1CKI
High Time
Synchronous, no prescaler 0.5 TCY + 20 — ns
Synchronous,
with prescaler
PIC18FXX20 10 — ns
PIC18LFXX20 25 — ns
Asynchronous PIC18FXX20 30 — ns
PIC18LFXX20 50 — ns
46 T
T1L T1CKI
Low Time
Synchronous, no prescaler 0.5 TCY + 5 — ns
Synchronous,
with prescaler
PIC18FXX20 10 — ns
PIC18LFXX20 25 — ns
Asynchronous PIC18FXX20 30 — ns
PIC18LFXX20 50 — ns
47 T
T1P T1CKI
Input
Period
Synchronous Greater of:
20 ns or T
CY + 40
N
—nsN = prescale
value
(1, 2, 4, 8)
Asynchronous 60 — ns
F
T1 T1CKI Oscillator Input Frequency Range DC 50 kHz
48 TCKE2TMRI Delay from External T1CKI Clock Edge to
Timer Increment
2 TOSC 7 TOSC —
Note: Refer to Figure 26-5 for load conditions.
CCPx
(Capture Mode)
50 51
52
CCPx
53
54
(Compare or PWM Mode)