MC68HC908GR16 Datasheet, PDF (260/276 Pages) Motorola, Inc – Microcontrollers

Electrical Specifications
20.9 Clock Generation Module Characteristics
20.9.1 CGM Component Specifications
Characteristic
External clock
Crystal load capacitance⁽¹⁾
Crystal fixed capacitance⁽²⁾
Crystal tuning capacitance
Feedback bias resistor
Series resistor⁽³⁾
Symbol
f_XCLK
C_L
C₁
C₂
R_B
R_S
Min
Typ
Max
Unit
30
32.768
100
kHz
—
12.5
—
pF
—
15
—
pF
—
15
—
pF
1
10
22
MΩ
100
330
470
kΩ
1. Crystal manufacturer value
2. Capacitor on OSC1 pin. Does not include parasitic capacitance due to package, pin, and board.
3. Capacitor on OSC2 pin. Does not include parasitic capacitance due to package, pin, and board.
20.9.2 CGM Electrical Specifications
Description
Operating voltage
Operating temperature
Crystal reference frequency
Range nominal multiplier
VCO center-of-range frequency⁽¹⁾
Medium-voltage VCO center-of-range frequency⁽²⁾
VCO range linear range multiplier
VCO power-of-two range multiplier
VCO multiply factor
VCO prescale multiplier
Reference divider factor
VCO operating frequency
Bus operating frequency⁽¹⁾
Bus frequency @ medium voltage⁽²⁾
Manual acquisition time
Automatic lock time
Symbol
V_DD
T
f_RCLK
f_NOM
f_VRS
f_VRS
L
2^E
N
2^P
R
f_VCLK
f_BUS
f_BUS
t_Lock
t_Lock
PLL jitter⁽³⁾
f_J
External clock input frequency
PLL disabled
External clock input frequency
PLL enabled
f_OSC
f_OSC
1. 5.0 V ± 10% V_DD
2. 3.3 V ± 10% V_DD
3. Deviation of average bus frequency over 2 ms. N = VCO multiplier.
Min
3.0
–40
30
—
38.4 k
38.4 k
1
1
1
1
1
38.4 k
—
—
—
—
0
dc
30 k
Typ
—
25
32.768
38.4
—
—
—
—
—
1
1
—
—
—
—
—
—
—
Max
5.5
125
100
—
40.0 M
40.0 M
255
4
4095
8
15
40.0 M
8.2
4.1
50
50
f_RCLK x
0.025% x
2^P N/4
32.8 M
Unit
V
o_C
kHz
kHz
Hz
Hz
Hz
MHz
MHz
ms
ms
Hz
Hz
—
1.5 M
Hz
MC68HC908GR16 Data Sheet, Rev. 5.0
260
Freescale Semiconductor