MC908MR16CFUE Datasheet, PDF (273/282 Pages) Freescale Semiconductor, Inc – On-chip programming firmware for use with host personal computer, Clock generator module (CGM)

CGM Acquisition/Lock Time Specifications
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
Symbol
C_FACT
K_ACQ
K_TRK
t_ACQ
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
t_AL
t_Lock
∆_TRK
∆_ACQ
∆_Lock
∆_UNL
n_ACQ
n_TRK
t_ACQ
Automatic stable to lock time
Automatic lock time
PLL jitter (deviation of average bus
frequency over 2 ms)
t_AL
t_Lock
f_J
Min
—
—
—
—
—
—
0
±6.3%
0
±0.9%
—
—
n_ACQ/f_XCLK
n_TRK/f_XCLK
—
0
Typ
0.0154
0.1135
0.0174
(8*V_DDA)/
(f_XCLK*K_ACQ)
(4*V_DDA)/
(f_XCLK*K_TRK)
t_ACQ+t_AL
—
—
—
—
32
128
(8*V_DDA)/
(f_XCLK*K_ACQ)
(4*V_DDA)/
(f_XCLK*K_TRK)
t_ACQ+t_AL
—
Max
—
—
—
—
—
—
± 3.6%
± 7.2%
± 0.9%
± 1.8%
—
—
—
—
—
± (f_XCLK)
*(0.025%)
*(N/4)
Notes
F/sV
V
V
If C_F chosen
correctly
If C_F chosen
correctly
If C_F chosen
correctly
If C_F chosen
correctly
N = VCO
freq. mult.
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
Freescale Semiconductor
273