參數(shù)資料
型號: DSPA56721AF
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: SymphonyTM DSP56720 / DSP56721 Multi-Core Audio Processors
中文描述: SymphonyTM DSP56720 / DSP56721多核音頻處理器
文件頁數(shù): 13/54頁
文件大?。?/td> 671K
代理商: DSPA56721AF
Symphony
TM
DSP56720 / DSP56721 Multi-Core Audio Processors, Rev.1
Freescale Semiconductor
13
2.1.7
External Clock Operation
The DSP56720/DSP56721 system clock is derived from the on-chip oscillator or is externally supplied. To use the on-chip
oscillator, connect a crystal and associated resistor/capacitor components to EXTAL and XTAL; see the example in
Figure 9
.
Figure 9. Using the On-Chip Oscillator
If the DSP56720/DSP56721 system clock is an externally supplied square wave voltage source, it is connected to EXTAL
(
Figure 10
). When the external square wave source is connected to EXTAL, the XTAL pin is not used.
Figure 10. External Clock Timing
Table 8. Clock Operation
No.
Characteristics
Symbol
Min
Max
Units
1
EXTAL input high
1
(40% to 60% duty cycle)
Crystal oscillator
Square wave input
Eth
16.67
2.5
100
inf
ns
XTAL
EXTAL
Suggested component values:
Fosc = 24.576 MHz
R = 1 M ±10%
C (EXTAL)= 18 pF
C (XTAL) = 18 pF
Calculations are for a 5 – 30 MHz crystal with the following parameters:
Shunt capacitance (C
0
) of 10 pF – 12 pF
Series resistance 40 Ohm
Drive level of 10
μ
W
R
XTAL1
C
C
EXTAL
V
IL
V
IH
Midpoint
Note:
The midpoint is 0.5 (V
IH
+ V
IL
).
ETH
ETL
ETC
2
3
1
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