Freescale Semiconductor MC68HC908MR32 Manual Do Utilizador
Electrical Specifications
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
272
Freescale Semiconductor
19.9 TImer Interface Module Characteristics
19.10 Clock Generation Module Component Specifications
19.11 CGM Operating Conditions
Characteristic
Symbol
Min
Max
Unit
Input capture pulse width
t
TIH,
t
TIL
125
—
ns
Input clock pulse width
t
TCH,
t
TCL
(1/f
OP
) + 5
—
ns
Characteristic
Symbol
Min
Typ
Max
Notes
Crystal load capacitance
C
L
—
—
—
Consult crystal
manufacturing data
Crystal fixed capacitance
C
1
—
2 * C
L
—
Consult crystal
manufacturing data
Crystal tuning capacitance
C
2
—
2 * C
L
—
Consult crystal
manufacturing data
Feedback bias resistor
R
B
—
22 M
Ω
—
Series resistor
R
S
0
330 k
Ω
1 M
Ω
Not required
Filter capacitor
C
F
—
C
FACT
*
(V
DDA
/f
XCLK
)
—
Bypass capacitor
C
BYP
—
0.1
µF
—
C
BYP
must provide low ac
impedance from
f = f
XCLK
/100 to 100*f
VCLK
, so
series resistance must be
considered
Characteristic
Symbol
Min
Typ
Max
Unit
Crystal reference frequency
f
XCLK
1
—
8
MHz
Range nominal multiplier
f
NOM
—
4.9152
—
MHz
VCO center-of-range frequency
f
VRS
4.9152
—
32.8
MHz
VCO frequency multiplier
N
1
—
15
—
VCO center of range multiplier
L
1
—
15
—
VCO operating frequency
f
VCLK
f
VRSMIN
—
f
VRSMAX
—