MC68HC908AT32 Datasheet, PDF (367/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

29.10 CGM Acquisition/Lock Time Information
CGM Acquisition/Lock Time Information
Description⁽¹⁾
Symbol
Min
Manual mode time to stable
t_ACQ
—
Typ
(8 x V_DDA)/(f_XCLK x K_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
Automatic stable to lock time
Automatic lock time
PLL jitter, deviation of average
bus frequency over 2 ms
t_AL
t_Lock
D_TRK
D_UNT
D_LOCK
D_UNL
n_ACQ
—
—
0
± 6.3%
0
± 0.9%
—
(4 x V_DDA)/(f_XCLK x K_TRK)
t_ACQ+t_AL
—
—
—
—
32
n_TRK
t_ACQ
t_AL
t_Lock
—
128
n_ACQ/f_XCLK
(8 x V_DDA)/(f_XCLK x K_ACQ)
n_TRK/f_XCLK
—
(4 x V_DDA)/(f_XCLK x K_TRK)
t_ACQ+t_AL
0
—
1. V_DD = 5.0 Vdc ± 10%, V_SS = 0 Vdc, T_A = –40°C to +125°C, unless otherwise noted.
2. GBNT guaranteed but not tested
Max
—
—
—
± 3.6%
Notes
If C_F chosen
correctly
If C_F chosen
correctly
± 7.2%
± 0.9%
± 1.8%
—
—
—
—
± (f_CRYS)
x (.025%)
x (N/4)
If C_F chosen
correctly
If C_F chosen
correctly
N = VCO Freq.
Mult.
(GBNT)⁽²⁾
29.11 Timer Module Characteristics
Characteristic
Input capture pulse width
Input clock pulse width
Symbol
t_TIH, t_TIL
t_TCH, t_TCL
Min
125
(1/f_OP) + 5
Max
—
—
Unit
ns
ns
MC68HC908AT32 Data Sheet, Rev. 3.1
Freescale Semiconductor
367