PIC17C75X Datasheet, PDF (235/320 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers

PIC17C75X
FIGURE 20-5: TIMER0 EXTERNAL CLOCK TIMINGS
RA1/T0CKI
40
41
42
TABLE 20-5: TIMER0 EXTERNAL CLOCK REQUIREMENTS
Param.
No.
Sym Characteristic
Min
Typ† Max Units Conditions
40
Tt0H T0CKI High Pulse Width No Prescaler
0.5TCY + 20 §
— — ns
With Prescaler
10*
— — ns
41
Tt0L T0CKI Low Pulse Width No Prescaler
0.5TCY + 20 §
— — ns
With Prescaler
10*
— — ns
42
Tt0P T0CKI Period
Greater of:
— — ns N = prescale value
20 ns or Tcy + 40 §
(1, 2, 4, ..., 256)
N
*
These parameters are characterized but not tested.
†
Data in "Typ" column is at 5V, 25˚C unless otherwise stated. These parameters are for design guidance only and are not
tested.
§
This specification ensured by design.
FIGURE 20-6: TIMER1, TIMER2, AND TIMER3 EXTERNAL CLOCK TIMINGS
TCLK12
or
TCLK3
TMRx
45
46
47
48
48
TABLE 20-6: TIMER1, TIMER2, AND TIMER3 EXTERNAL CLOCK REQUIREMENTS
Param.
No.
Sym Characteristic
Typ
Min
† Max Units Conditions
45
46
47
48
*
†
§
Tt123H TCLK12 and TCLK3 high time
0.5TCY + 20 § — —
ns
Tt123L TCLK12 and TCLK3 low time
0.5TCY + 20 § — —
ns
Tt123P TCLK12 and TCLK3 input period
TCY + 40 § — —
N
ns N = prescale value
(1, 2, 4, 8)
TckE2tmrI Delay from selected External Clock Edge to
Timer increment
2TOSC § — 6Tosc § —
These parameters are characterized but not tested.
Data in “Typ” column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
This specification ensured by design.
© 1997 Microchip Technology Inc.
Preliminary
DS30264A-page 235