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MC68HC705P9 Datasheet, PDF (95/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit　
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Timing
Timer
Timing
Table 1. Timer Characteristics (VDD = 5.0 Vdc)(1)
Characteristic
Symbol Min Max Unit
Timer Resolution(2)
Input Capture Pulse Width
Input Capture Pulse Period
tRESL
4.0
—
tCYC
tH, tL
125
—
ns
tTLTL
Note
(3)
—
tCYC
1. VDD = 5.0 Vdc ± 10%, TA = TL to TH unless otherwise noted.
2. A 2-bit prescaler in the timer is the limiting factor as it counts 4 tCYC.
3. The minimum tTLTL should not be less than the number of interrupt service routine cycles
plus 19 tCYC.
Table 2. Timer Characteristics (VDD = 3.3 Vdc)(1)
Characteristic
Timer Resolution(2)
Input Capture Pulse Width
Input Capture Pulse Period
Symbol
tRESL
tH, tL
tTLTL
Min
4.0
250
Note
(3)
Max
—
—
—
Unit
tCYC
ns
tCYC
1. VDD = 3.3 Vdc ± 10%, TA = TL to TH unless otherwise noted.
2. A 2-bit prescaler in the timer is the limiting factor as it counts 4 tCYC.
3. The minimum tTLTL should not be less than the number of interrupt service routine cycles
plus 19 tCYC.
tTLTL
tTH
tTL
Figure 5. Input Capture Characteristics
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MOTOROLA
Timer
95
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