MC68HC908MR8 Datasheet, PDF (348/372 Pages) Motorola, Inc – Microcontrollers

Electrical Specifications
21.12 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)
Symbol
C_FACT
K_ACQ
K_TRK
t_ACQ
t_AL
t_Lock
∆_TRK
∆_ACQ
∆_Lock
∆_UNL
n_ACQ
n_TRK
t_ACQ
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_CRYS)
* (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.
(GBNT)
Technical Data
348
Electrical Specifications
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor