mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 319

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

20.7 Control Timing
20.8 Oscillator Characteristics
MC68HC908JB16
Freescale Semiconductor
Notes:
Notes:
Notes:
Internal operating frequency
RST input pulse width low
Crystal frequency
External clock
Reference frequency
Crystal load capacitance
Crystal fixed capacitance
Crystal tuning capacitance
Feedback bias resistor
Series resistor
1. V
2. Typical values reflect average measurements at midpoint of voltage range, 25 °C only.
3. Run (operating) I
4. Wait I
5. STOP I
6. Maximum is highest voltage that POR is guaranteed.
7. If minimum V
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.
1. The USB module is designed to operate with f
2. No more than 10% duty cycle deviation from 50%.
3. Consult crystal vendor data sheet.
4. Not required for high-frequency crystals.
loads. Less than 100 pF on all outputs. C
affects run I
than 100 pF on all outputs. C
as inputs; OSC2 capacitance linearly affects wait I
V
information.
DD
DD
DD
= 4.0 to 5.5 Vdc, V
= 4.0 to 5.5 Vdc; V
is reached.
DD
DD
measured using external square wave clock source (f
Characteristic
measured with USB in suspend mode; OSC1 grounded; no port pins sourcing current.
DD
DD
(3), (4)
. Measured with all modules enabled.
is not reached before the internal POR reset is released, RST must be driven low externally until minimum
—
DD
(1)
Rev. 1.1
measured using external square wave clock source (f
(1), (2)
Characteristic
SS
SS
(3)
(3)
(3)
= 0 Vdc, T
= 0 Vdc; timing shown with respect to 20% V
(3)
(2)
L
= 20 pF on OSC2; 15 kΩ ± 5% termination resistors on D+ and D– pins; all ports configured
A
= T
(1)
L
L
to T
= 20 pF on OSC2. All ports configured as inputs. OSC2 capacitance linearly
Symbol
Electrical Specifications
XCLK
f
f
XCLK
XCLK
H
C
C
C
R
R
, unless otherwise noted.
B
S
L
1
2
DD
= 12 MHz.
Min
XCLK
dc
—
—
—
—
—
1
= 12MHz); all inputs 0.2 V from rail; no dc loads; less
Symbol
DD
t
f
IRL
OP
XCLK
and 70% V
10 MΩ
2 × C
2 × C
Typ
12
12
—
—
= 12MHz). All inputs 0.2 V from rail. No dc
L
L
DD
Min
125
—
, unless otherwise noted.
Max
12
12
—
—
—
—
—
Electrical Specifications
Max
—
6
Technical Data
MHz
MHz
Unit
MHz
Unit
ns
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