MC68HC705P9 Datasheet, PDF (105/160 Pages) Motorola, Inc – HCMOS Microcontroller Unit

9.5 Timing
Freescale Semiconductor, Inc.
Timer
Timing
Table 9-1. Timer Characteristics (V_DD = 5.0 Vdc)⁽¹⁾
Characteristic
Symbol Min Max Unit
Timer Resolution⁽²⁾
t_RESL
4.0
—
t_CYC
Input Capture Pulse Width
t_H, t_L
125
—
ns
Input Capture Pulse Period
Note
t_TLTL
(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 9-2. Timer Characteristics (V_DD = 3.3 Vdc)⁽¹⁾
Characteristic
Symbol Min Max Unit
Timer Resolution⁽²⁾
t_RESL
4.0
—
t_CYC
Input Capture Pulse Width
t_H, t_L
250
—
ns
Input Capture Pulse Period
Note
t_TLTL
(3)
—
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 9-5. Input Capture Characteristics
MC68HC705P9 — Rev. 4.0
MOTOROLA
Timer
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Technical Data
105