mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 275

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

21.7 Control Timing
21.8 Oscillator Characteristics
MC68HC908BD48
Freescale Semiconductor
Internal Operating Frequency
RST Input Pulse Width Low
Crystal Frequency
External Clock
Crystal Load Capacitance
Crystal Fixed Capacitance
Crystal Tuning Capacitance
Feedback Bias Resistor
Series Resistor
NOTES:
1. V
2. Some modules may require a minimum frequency greater than dc for proper operation; see appropriate table for this
3. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
Reference Frequency
NOTES:
1. The sync processor module is designed to function at f
2. No more than 10% duty cycle deviation from 50%
3. Quoted values are for reference only. Actual values depend on application and crystal performance.
4. Not Required for high frequency crystals
information.
cations.
Please consult crystal vendor data sheet
DD
= 4.5 to 5.5 Vdc, V
Characteristic
(3), (4)
—
(1)
Rev. 2.1
(1), (2)
Characteristic
SS
(3)
(3)
= 0 Vdc; timing shown with respect to 20% V
(3)
(3)
(2)
f
f
Symbol
OSCXCLK
OSCXCLK
Electrical Specifications
C
C
C
R
R
B
S
L
1
2
OSCXCLK
Min
—
dc
—
—
—
—
—
= 24MHz. The values given here are oscillator specifi-
Symbol
t
f
DD
IRL
OP
and 70% V
Typ
24
30
15
15
10
—
—
Min
50
—
DD
, unless otherwise noted.
Max
24
—
—
—
—
—
—
Electrical Specifications
Max
—
6
Data Sheet
Unit
MHz
MHz
MΩ
pF
pF
pF
MHz
Unit
ns
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