參數(shù)資料
型號: DSP56367P
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
元件分類: 數(shù)字信號處理
英文描述: 24-Bit Audio Digital Signal Processor
中文描述: 24位音頻數(shù)字信號處理器
文件頁數(shù): 29/100頁
文件大小: 1039K
代理商: DSP56367P
External Clock Operation
DSP56367 Technical Data, Rev. 2.1
Freescale Semiconductor
3-5
3.7
External Clock Operation
The DSP56367 system clock is an externally supplied square wave voltage source connected to
EXTAL(
Figure 3-1
).
Figure 3-1 External Clock Timing
Internal clock cycle time with PLL disabled
T
C
2
×
ET
C
Instruction cycle time
I
CYC
T
C
1
DF = Division Factor
Ef = External frequency
ET
C
= External clock cycle
MF = Multiplication Factor
PDF = Predivision Factor
T
C
= internal clock cycle
2
Refer to the
DSP56300 Family Manual
for a detailed discussion of the PLL.
Table 3-5 Clock Operation
No.
Characteristics
Symbol
Min
Max
1
Frequency of EXTAL (EXTAL Pin Frequency)
The rise and fall time of this external clock should be 2 ns maximum.
Ef
2.0 ns
150.0
2
EXTAL input high
1, 2
With PLL disabled (46.7%–53.3% duty cycle
3
)
With PLL enabled (42.5%–57.5% duty cycle
3
)
ET
H
3.11 ns
2.83 ns
157.0
μ
s
3
EXTAL input low
1, 2
With PLL disabled (46.7%–53.3% duty cycle
3
)
With PLL enabled (42.5%–57.5% duty cycle
3
)
ET
L
3.11 ns
2.83 ns
157.0
μ
s
Table 3-4 Internal Clocks (continued)
Characteristics
Symbol
Expression
1, 2
Min
Typ
Max
EXTAL
V
ILC
V
IHC
Midpoint
Note: The midpoint is 0.5 (V
IHC
+ V
ILC
).
ET
H
ET
L
ET
C
3
4
2
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