mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 257

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

18.7 Control Timing
18.8 Oscillator Characteristics
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
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 infor-
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 function at 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
and D– and 15 k
V
mation.
DD
DD
REG
= 4.0 to 5.5 Vdc, V
= 4.0 to 5.5 Vdc; V
DD
is reached.
DD
measured using external square wave clock source (f
Characteristic
measured with USB in suspend mode; OSC1 grounded; transceiver pullup resistor of 1.5 k
DD
REG
(3), (4)
. Measured with all modules enabled.
(1)
DD
is not reached before the internal POR reset is released, RST must be driven low externally until minimum
measured using external square wave clock source (f
(1), (2)
5% termination resistors on D+ and D– pins; no port pins sourcing current.
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 k
A
= T
(1)
L
L
to T
= 20 pF on OSC2. All ports configured as inputs. OSC2 capacitance linearly
XCLK
Symbol
Electrical Specifications
f
f
XCLK
XCLK
H
C
C
C
R
R
, unless otherwise noted.
B
S
= 6 MHz.
L
1
2
DD
5% termination resistors on D+ and D– pins; all ports configured
Min
XCLK
dc
—
—
—
—
—
1
= 6 MHz); all inputs 0.2 V from rail; no dc loads; less
Symbol
DD
t
f
IRL
OP
XCLK
and 70% V
10 M
2 C
2 C
Typ
—
—
—
—
= 6 MHz). All inputs 0.2 V from rail. No dc
L
L
DD
Min
125
—
, unless otherwise noted.
Max
—
—
—
—
—
Electrical Specifications
6
6
Max
—
3
5% between V
Technical Data
Control Timing
MHz
MHz
Unit
MHz
Unit
ns
REG
257