參數(shù)資料
型號: MCF5270
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: 32-bit Embedded Controller Division
中文描述: 32位嵌入式控制器部
文件頁數(shù): 36/56頁
文件大?。?/td> 1096K
代理商: MCF5270
MCF5271 Integrated Microprocessor Hardware Specification, Rev. 1.2
Preliminary Electrical Characteristics
Freescale Semiconductor
36
8.4
Oscillator and PLLMRFM Electrical Characteristics
Table 29. HiP7 PLLMRFM Electrical Specifications
1
NOTES:
1
All values given are initial design targets and subject to change.
2
All internal registers retain data at 0 Hz.
3
“Loss of Reference Frequency” is the reference frequency detected internally, which transitions the PLL
into self clocked mode.
4
Self clocked mode frequency is the frequency that the PLL operates at when the reference frequency falls
below f
LOR
with default MFD/RFD settings.
5
This parameter is guaranteed by characterization before qualification rather than 100% tested.
6
Proper PC board layout procedures must be followed to achieve specifications.
Num
Characteristic
Symbol
Min.
Value
Max.
Value
Unit
1
PLL Reference Frequency Range
Crystal reference
External reference
1:1 mode (NOTE: f
sys/2
= 2
×
f
ref_1:1
)
f
ref_crystal
f
ref_ext
f
ref_1:1
8
8
24
25
25
50
MHz
2
Core frequency
CLKOUT Frequency
2
External reference
On-Chip PLL Frequency
f
sys
f
sys/2
0
f
ref
/ 32
100
50
50
MHz
MHZ
MHz
3
Loss of Reference Frequency
3, 5
f
LOR
100
1000
kHz
4
Self Clocked Mode Frequency
4, 5
f
SCM
10.25
15.25
MHz
5
Crystal Start-up Time
5, 6
t
cst
10
ms
6
XTAL Load Capacitance
5
5
30
pF
7
PLL Lock Time
5, 7,13
t
lpll
750
μ
s
8
Power-up To Lock Time
5, 6,8
With Crystal Reference (includes 5 time)
Without Crystal Reference
9
t
lplk
11
750
ms
μ
s
9
1:1 Mode Clock Skew (between CLKOUT
and EXTAL)
10
t
skew
–1
1
ns
10
Duty Cycle of reference
5
t
dc
40
60
%
11
Frequency un-LOCK Range
f
UL
–3.8
4.1
% f
sys/2
12
Frequency LOCK Range
f
LCK
–1.7
2.0
% f
sys/2
13
CLKOUT Period Jitter,
5, 6, 8,11, 12
Measured at f
sys/2
Max
Peak-to-peak Jitter (Clock edge to clock
edge)
Long Term Jitter (Averaged over 2 ms
interval)
C
jitter
5.0
.01
% f
sys/2
14
Frequency Modulation Range Limit
13
,
14
(f
sys/2
Max must not be exceeded)
C
mod
0.8
2.2
%f
sys/2
15
ICO Frequency. f
ico
= f
ref
*
2
*
(MFD+2)
15
f
ico
48
75
MHz
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