mc68hc908lb8 Freescale Semiconductor, Inc, mc68hc908lb8 Datasheet - Page 224

• Manufacturer Part Number: mc68hc908lb8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Electrical Specifications
20.7 Oscillator Characteristics
224
NOTES:
NOTES:
Internal oscillator frequency (factory trimmed)
Crystal frequency, XTALCLK
External RC oscillator frequency, RCCLK
External clock reference frequency
Crystal load capacitance
Crystal fixed capacitance
Crystal tuning capacitance
Feedback bias resistor
RC oscillator external resistor
1. V
2. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
3. Minimum pulse width is for guaranteed interrupt. It is possible for a smaller pulse width to be recognized.
1. Characterization shows that ± 3.5% could be achieved from -40 to 85
2. No more than 10% duty cycle deviation from 50%.
3. Consult crystal vendor data sheet.
SS
= 0 Vdc; timing shown with respect to 20% V
Characteristic
RST
IRQ
(3)
(2)
(2)
(2)
Figure 20-1. RST and IRQ Timing
MC68HC908LB8 Data Sheet, Rev. 1
t
t
ILIH
RL
DD
and 70% V
f
f
Symbol
OSCXCLK
OSCXCLK
f
f
INTCLK
RCCLK
R
t
R
C
C
C
ILIL
EXT
L
1
2
B
DD
unless otherwise noted.
°
C.
15.2
Min
dc
—
—
—
—
8
2
See
Figure 20-2
2 x C
2 x C
16
Typ
20
10
—
—
—
(1)
L
L
Freescale Semiconductor
Max
16.8
24
12
32
—
—
—
—
MHz
MHz
MHz
MHz
Unit
MΩ
pF
—
—
—