MC68HC705C8A_13 Datasheet, PDF (181/222 Pages) Freescale Semiconductor, Inc – Technical Data

Freescale Semiconductor, Inc.
Electrical Specifications
5.0-Volt Control Timing
13.9 5.0-Volt Control Timing
Characteristic⁽¹⁾
Symbol
Min
Max
Unit
Frequency of operation
Crystal option
External clock option
f_OSC
—
dc
4.2
MHz
4.2
Internal operating frequency
Crystal (f_OSC ÷ 2)
External clock (f_OSC ÷ 2)
f_OP
—
2.1
MHz
dc
2.1
Cycle time (see Figure 13-7)
t_CYC
480
—
ns
Crystal oscillator startup time (see Figure 13-7)
t_OXOV
—
100
ms
Stop recovery startup time (crystal oscillator)
(see Figure 13-6)
t_ILCH
—
100
ms
RESET pulse width (see Figure 13-7)
t_RL
8
—
t_CYC
Timer
Resolution⁽²⁾
Input capture pulse width (see Figure 13-5)
Input capture pulse period (see Figure 13-5)
t_RESL
4.0
—
t_CYC
t_TH, t_TL
125
—
ns
t_TLTL
(3)
—
t_CYC
Interrupt pulse width low (edge-triggered)
(see Figure 4-2. External Interrupt Timing)
t_ILIH
125
—
ns
Interrupt pulse period
(see Figure 4-2. External Interrupt Timing)
t_ILIL
(4)
—
t_CYC
OSC1 pulse width
t_OH, t_OL
90
—
ns
1. V_DD = 5.0 Vdc ± 10%, V_SS = 0 Vdc; T_A = T_L to T_H
2. Since a 2-bit prescaler in the timer must count four internal cycles (t_CYC), this is the limiting minimum factor in determining
the timer resolution.
3. The minimum period, t_TLTL, should not be less than the number of cycle times it takes to execute the capture interrupt ser-
vice routine plus 24 t_CYC.
4. The minimum period, t_ILIL, should not be less than the number of cycle times it takes to execute the interrupt service routine
plus 19 t_CYC.
MC68HC705C8A — Rev. 3
MOTOROLA
Electrical Specifications
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Technical Data