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PIC17C44 Datasheet, PDF (158/241 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM/ROM Microcontroller | |||
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PIC17C4X
Applicable Devices 42 R42 42A 43 R43 44
FIGURE 17-5: TIMER0 CLOCK TIMINGS
RA1/T0CKI
40
41
42
TABLE 17-5: TIMER0 CLOCK REQUIREMENTS
Parameter
No.
Sym Characteristic
Min
Typâ Max Units Conditions
40
Tt0H T0CKI High Pulse Width
No Prescaler
0.5TCY + 20 § â â ns
With Prescaler
10*
â â ns
41
Tt0L T0CKI Low Pulse Width
No Prescaler
0.5TCY + 20 § â â ns
With Prescaler
10*
â â ns
42
Tt0P T0CKI Period
TCY + 40 § â â ns N = prescale value
N
(1, 2, 4, ..., 256)
*
These parameters are characterized but not tested.
â
Data in "Typ" column is at 5V, 25ËC unless otherwise stated. These parameters are for design guidance only and are not
tested.
§
This speciï¬cation ensured by design.
FIGURE 17-6: TIMER1, TIMER2, AND TIMER3 CLOCK TIMINGS
TCLK12
or
TCLK3
TMRx
45
46
47
48
48
TABLE 17-6: TIMER1, TIMER2, AND TIMER3 CLOCK REQUIREMENTS
Parameter
No.
Sym Characteristic
Typ
Min
â Max Units Conditions
45
46
47
48
*
â
§
Tt123H TCLK12 and TCLK3 high time
0.5 TCY + 20 § â â
ns
Tt123L TCLK12 and TCLK3 low time
0.5 TCY + 20 § â â
ns
Tt123P TCLK12 and TCLK3 input period
TCY + 40 § â â
N
ns N = prescale value
(1, 2, 4, 8)
TckE2tmrI Delay from selected External Clock Edge to
Timer increment
2TOSC §
â 6 Tosc § â
These parameters are characterized but not tested.
Data in "Typ" column is at 5V, 25ËC unless otherwise stated. These parameters are for design guidance only and are not
tested.
This speciï¬cation ensured by design.
DS30412C-page 158
© 1996 Microchip Technology Inc.
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