Control Timing; Oscillator Characteristics - Freescale Semiconductor MC68HC08KH12 Datasheet

17.7 Control Timing

Internal Operating Frequency
RST Input Pulse Width Low
NOTES:
1. V = 4.0 to 5.5 Vdc, V
DD
2. Some modules may require a minimum frequency greater than dc for proper operation; see appropriate table for this
information.
3. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.

17.8 Oscillator Characteristics

Characteristic
(1)
Crystal Frequency
External Clock
Reference Frequency
Crystal Load Capacitance
Crystal Fixed Capacitance
Crystal Tuning Capacitance
Feedback Bias Resistor
(3), (4)
Series Resistor
NOTES:
1. The USB module is designed to function at f
oscillator specifications.
2. No more than 10% duty cycle deviation from 50%
3. Consult crystal vendor data sheet
4. Not Required for high frequency crystals
MC68HC(7)08KH12 Rev. 1.1
—
Freescale Semiconductor
Characteristic
(2)
(3)
= 0 Vdc; timing shown with respect to 20% V
SS
Symbol
f
CGMXCLK
f
(1), (2)
CGMXCLK
(3)
C
(3)
C
(3)
C
R
R
CGMXCLK
Symbol
f
OP
t
IRL
DD
Min
—
dc
—
L
—
1
—
2
—
B
—
S
= 6MHz and CGMVCLK = 48MHz. The values given here are
Min Max
—
50 —
and 70% V , unless otherwise noted.
DD
Typ Max
6
—
24
—
— —
2 × C
—
L
2 × C
—
L
10 —
— —
Advance Information
Unit
6 MHz
ns
Unit
MHz
MHz
MΩ
251