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19.12 CGM Acquisition/Lock Time Specifications
Description
Filter capacitor multiply factor
Acquisition mode time factor
Tracking mode time factor
Manual mode time to stable
Manual stable to lock time
Manual acquisition time
Tracking mode entry frequency
tolerance
Acquisition mode entry frequency
tolerance
Lock entry frequency tolerance
Lock exit frequency tolerance
Reference cycles per acquisition mode
measurement
Reference cycles per tracking mode
measurement
Automatic mode time to stable
Automatic stable to lock time
Automatic lock time
PLL jitter (deviation of average bus
frequency over 2 ms)
Freescale Semiconductor
Symbol
C
FACT
K
ACQ
K
TRK
t
ACQ
t
AL
t
Lock
∆
TRK
±
∆
ACQ
∆
Lock
±
∆
UNL
n
ACQ
n
TRK
t
n
ACQ
ACQ
t
n
AL
TRK
t
Lock
f
J
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
CGM Acquisition/Lock Time Specifications
Min
Typ
—
0.0154
—
0.1135
—
0.0174
(8*V
)/
DDA
—
(f
*K
XCLK
ACQ)
(4*V
)/
DDA
—
(f
*K
)
XCLK
TRK
t
+t
—
ACQ
AL
0
—
—
6.3%
0
—
—
0.9%
—
32
—
128
(8*V
)/
DDA
/f
XCLK
(f
*K
XCLK
ACQ)
(4*V
)/
DDA
/f
XCLK
(f
*K
)
XCLK
TRK
t
+t
—
ACQ
AL
0
—
Max
Notes
—
F/sV
—
V
—
V
If C
chosen
F
—
correctly
If C
chosen
F
—
correctly
—
± 3.6%
± 7.2%
± 0.9%
± 1.8%
—
—
If C
chosen
F
—
correctly
If C
chosen
F
—
correctly
—
± (f
)
XCLK
N = VCO
*(0.025%)
freq. mult.
*(N/4)
273
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