
MC68HC08BD24 — Rev. 1.1
Technical Data
Freescale Semiconductor
235
19.7 Control Timing
19.8 Oscillator Characteristics
NOTES:
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted.
2. Typical values reflect average measurements at midpoint of voltage range, 25
°C only.
3. Run (operating) IDD measured using external square wave clock source. All inputs 0.2 V from rail. No dc loads. Less than 100 pF on all
outputs. CL = 15 pF on OSC2. All ports configured as inputs. OSC2 capacitance linearly affects run IDD. Measured with all modules
enabled.
4. Wait IDD measured using external square wave clock source (fOSCXCLK = 24MHz); all inputs 0.2 V from rail; no dc loads; less than 100 pF
on all outputs. CL = 15pF on OSC2; all ports configured as inputs; OSC2 capacitance linearly affects wait IDD.
5. STOP IDD measured with OSC1 grounded; no port pins sourcing current.
6. Maximum is highest voltage that POR is guaranteed.
7. If minimum VDD is not reached before the internal POR reset is released, RST must be driven low externally until minimum VDD is
reached.
Characteristic
Symbol
Min
Max
Unit
Internal Operating Frequency(2)
fOP
—6
MHz
RST Input Pulse Width Low(3)
tIRL
50
—
ns
NOTES:
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc; timing shown with respect to 20% VDD and 70% VDD, unless otherwise noted.
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.
Characteristic
Symbol
Min
Typ
Max
Unit
Crystal Frequency(1)
fOSCXCLK
—
24
—
MHz
External Clock
Reference Frequency(1), (2)
fOSCXCLK
dc
—
24
MHz
Crystal Load Capacitance(3)
CL
—15
—
pF
Crystal Fixed Capacitance(3)
C1
—2
× C
L
—
Crystal Tuning Capacitance(3)
C2
—2
× C
L
—
Feedback Bias Resistor
RB
—10
—
M
Series Resistor(3), (4)
RS
——
—
NOTES:
1. The sync processor module is designed to function at fOSCXCLK = 24MHz.
The values given here are 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
Characteristic
Symbol
Min
Typ(2)
Max
Unit