MC68HC05P9A Datasheet, PDF (91/158 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Timing
Freescale Semiconductor, Inc.
Timer
Timing
Table 19. Timer Characteristics (V_DD = 5.0 Vdc)⁽¹⁾
Characteristic
Symbol Min Max Unit
Timer Resolution⁽²⁾
Input Capture Pulse Width
Input Capture Pulse Period
t_RESL
4.0
—
t_CYC
t_H, t_L
125
—
ns
t_TLTL
Note
(3)
—
t_CYC
1. V_DD = 5.0 Vdc ± 10%, T_A = T_L to T_H unless otherwise noted.
2. A 2-bit prescaler in the timer is the limiting factor as it counts 4 t_CYC.
3. The minimum t_TLTL should not be less than the number of interrupt service routine cycles
plus 19 t_CYC.
Table 20. Timer Characteristics (V_DD = 3.3 Vdc)⁽¹⁾
Characteristic
Timer Resolution⁽²⁾
Input Capture Pulse Width
Input Capture Pulse Period
Symbol
t_RESL
t_H, t_L
t_TLTL
Min
4.0
250
Note
(3)
Max
—
—
—
Unit
t_CYC
ns
t_CYC
1. V_DD = 3.3 Vdc ± 10%, T_A = T_L to T_H unless otherwise noted.
2. A 2-bit prescaler in the timer is the limiting factor as it counts 4 t_CYC.
3. The minimum t_TLTL should not be less than the number of interrupt service routine cycles
plus 19 t_CYC.
t_TLTL
t_TH
t_TL
Figure 46. Input Capture Characteristics
11-tim1ic1oc_a
MOTOROLA
Timer
91
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