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PIC17C7XX Datasheet, PDF (250/328 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D | |||
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PIC17C7XX
FIGURE 20-5: TIMER0 EXTERNAL CLOCK TIMINGS
RA1/T0CKI
40
41
42
TABLE 20-5: TIMER0 EXTERNAL CLOCK REQUIREMENTS
Param
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
With Prescaler
0.5TCY + 20 §
10*
â â ns
â â ns
42
Tt0P T0CKI Period
Greater of:
â â ns N = prescale value
20 ns or TCY + 40 §
(1, 2, 4, ..., 256)
N
*
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 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
â Max Units Conditions
45
46
47
48
*
â
§
Tt123H TCLK12 and TCLK3 high time
Tt123L TCLK12 and TCLK3 low time
0.5TCY + 20 § â â
ns
0.5TCY + 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 6Tosc § â
These parameters are characterized but not tested.
Data in âTypâ column is at 5V, 25âC unless otherwise stated. These parameters are for design guidance only and are not
tested.
This speciï¬cation ensured by design.
DS30289A-page 250
Preliminary
© 1998 Microchip Technology Inc.
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