mcf51cn128 Freescale Semiconductor, Inc, mcf51cn128 Datasheet - Page 22

• Manufacturer Part Number: mcf51cn128
• Description: Mcf51cn128 Coldfire Microcontroller Cover Mcf51cn128
• Manufacturer: Freescale Semiconductor, Inc

1
2
3
4
5
6
Electrical Characteristics
22
Num C
10
11
12
13
14
15
16
17
18
19
8
9
TRIM register at default value (0x80) and FTRIM control bit at default value (0x0).
This specification applies to any time the FLL reference source or reference divider is changed, trim value changed or changing
from FLL disabled (BLPE, BLPI) to FLL enabled (FEI, FEE, FBE, FBI). If a crystal/resonator is being used as the reference,
this specification assumes it is already running.
This specification applies to any time the PLL VCO divider or reference divider is changed, or changing from PLL disabled
(BLPE, BLPI) to PLL enabled (PBE, PEE). If a crystal/resonator is being used as the reference, this specification assumes it is
already running.
Jitter is the average deviation from the programmed frequency measured over the specified interval at maximum f
Measurements are made with the device powered by filtered supplies and clocked by a stable external clock signal. Noise
injected into the FLL circuitry via V
given interval.
Below D
MCG is already in lock, then the MCG may stay in lock.
Below D
Table 11. MCG Frequency Specifications (continued)(Temperature Range = –40 to 125 °C Ambient)
C
C
C FLL acquisition time
D PLL acquisition time
C
D VCO operating frequency
D Lock entry frequency tolerance
D Lock exit frequency tolerance
D Lock time - FLL
D Lock time - PLL
D
P
Resolution of trimmed DCO output
frequency at fixed voltage and
temperature (not using FTRIM)
Total deviation of trimmed DCO output
frequency over voltage and
temperature
Total deviation of trimmed DCO output
frequency over fixed voltage and
temperature range of 0 - 70
Long term Jitter of DCO output clock
(averaged over 2ms interval)
Loss of external clock minimum
frequency - RANGE = 0
lock
unl
minimum, the MCG does not exit lock if already in lock. Above D
minimum, the MCG is guaranteed to enter lock. Above D
Rating
2
3
MCF51CN128 ColdFire Microcontroller Data Sheet, Rev. 4
DD
°C
and V
4
6
5
SS
and variation in crystal oscillator frequency increase the C
Δf
t
t
Symbol
pll_acquire
fll_acquire
f
Δf
Δf
t
t
dco_res_t
C
pll_lock
loc_low
D
fll_lock
D
f
dco_t
dco_t
Jitter
vco
lock
unl
lock
maximum, the MCG does not enter lock. But if the
(3/5) x f
± 1.49
± 4.47
unl
Min
7.0
—
—
—
—
—
—
—
—
maximum, the MCG is guaranteed to exit lock.
int
Typical
+ 0.5
± 0.2
± 0.5
0.02
-1.0
—
—
—
—
—
—
—
—
Freescale Semiconductor
1075(1/
t
1075(1/
t
pll_acquire+
fll_acquire+
± 2.98
± 5.97
± 0.4
Max
55.0
± 2
± 1
0.2
Jitter
ef)
—
1
1
)
f
f
int_t
pll_r
percentage for a
BUS
%f
%f
%f
%f
MHz
Unit
kHz
ms
ms
%
%
.
s
s
dco
dco
dco
dco