Datasheet

PIC17C7XX
DS30289C-page 252  1998-2013 Microchip Technology Inc.
FIGURE 20-9: TIMER0 EXTERNAL CLOCK TIMINGS
TABLE 20-4: TIMER0 EXTERNAL CLOCK REQUIREMENTS
FIGURE 20-10: TIMER1, TIMER2 AND TIMER3 EXTERNAL CLOCK TIMINGS
TABLE 20-5: TIMER1, TIMER2 AND TIMER3 EXTERNAL CLOCK REQUIREMENTS
RA1/T0CKI
40 41
42
Param
No.
Sym Characteristic Min Typ† Max Units Conditions
40 Tt0H T0CKI High Pulse Width No Prescaler 0.5T
CY + 20 — — ns
With Prescaler 10 — — ns
41 Tt0L T0CKI Low Pulse Width No Prescaler 0.5T
CY + 20 — — ns
With Prescaler 10 — — ns
42 Tt0P T0CKI Period Greater of:
20 ns or T
CY + 40
N
— — ns N = prescale
value (1, 2, 4, ...,
256)
† Data in "Typ" column is at 5V, 25°C unless otherwise stated.
TCLK12
45
46
or
TCLK3
TMRx
48
48
47
Param
No.
Sym Characteristic Min Typ† Max Units Conditions
45 Tt123H TCLK12 and TCLK3 high time 0.5T
CY + 20 — — ns
46 Tt123L TCLK12 and TCLK3 low time 0.5T
CY + 20 — — ns
47 Tt123P TCLK12 and TCLK3 input period T
CY + 40
N
— — ns N = prescale
value (1, 2, 4, 8)
48 TckE2tmrI Delay from selected External Clock Edge to
Timer increment
2T
OSC —6Tosc —
† Data in “Typ” column is at 5V, 25C unless otherwise stated.