mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 692

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Electrical Characteristics
For N < 1000, the following equation is a good fit for the maximum jitter:
1
2
3
692
Conditions are shown in
Num C
10
11
12
Bus frequency is equivalent to f
% deviation from target frequency
f
1
2
3
4
5
7
8
9
OSC
=4MHz, f
P Self Clock Mode frequency
D Lock Detection
D Un-Lock Detection
C Time to lock
C Jitter fit parameter 1
C Jitter fit parameter 2
C Bus Frequency for FM1=1, FM0=1 (frequency
C Bus Frequency for FM1=1, FM0=0 (frequency
C Bus Frequency for FM1=0, FM0=1 (frequency
T VCO locking range
T Reference Clock
modulation in PLLCTL register of s12xe_crg)
modulation in PLLCTL register of s12xe_crg)
modulation in PLLCTL register of s12xe_crg)
BUS
On timers and serial modules a prescaler will eliminate the effect of the jitter
to a large extent.
=40MHz equivalent f
Table A-4
J(N)
3
3
Figure A-5. Maximum bus clock jitter approximation
SCM
unless otherwise noted
Rating
1
/2
1
PLL
S12XS Family Reference Manual, Rev. 1.10
=80MHz: REFDIV=$00, REFRQ=01, SYNDIV=$09, VCOFRQ=01, POSTDIV=$00
Table A-24. IPLL Characteristics
5
J N
( )
10
=
NOTE
------- -
j
1
N
+
j
Symbol
2
|∆
f
f
|∆
f
t
SCM
f
f
f
VCO
REF
Lock
lock
bus
bus
bus
j
j
unl
1
2
|
|
20
Min
0.5
32
—
—
—
—
—
—
1
1
0
N
Typ
214
—
—
—
—
—
—
—
—
—
—
Freescale Semiconductor
256/f
150 +
Max
120
1.5
2.5
1.2
40
38
39
39
4
0
REF
MHz
MHz
MHz
MHz
MHz
MHz
Unit
%
%
µs
%
%
2
2