參數(shù)資料
型號(hào): DSP56F827E
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: 16-bit Digital Signal Controllers
中文描述: 16位數(shù)字信號(hào)控制器
文件頁數(shù): 32/60頁
文件大?。?/td> 811K
代理商: DSP56F827E
56F827 Technical Data, Rev. 12
32
Freescale Semiconductor
3.6.3
The recommended method of connecting an external clock is given in
Figure 3-11
. The external clock
source is connected to XTAL and the EXTAL pin is held V
DDA
/2.
External Clock Source
Figure 3-11 Connecting an External Clock Signal
Figure 3-12 External Clock Timing
Table 3-8 External Clock Operation Timing Requirements
Operating Conditions:
V
SSIO
=V
SS
= V
SSA
= 0V, V
DDA
=V
DDIO
=3.0–3.6V, V
DD
= 2.25–2.75V, T
A
= –40
°
to +85
°
C, C
L
50pF, f
op
= 80MHz
Characteristic
Symbol
Min
Typ
Max
Unit
Frequency of operation (external clock driver)
1
1.
See
Figure 3-11
for details on using the recommended connection of an external clock driver.
f
osc
0
4
80
2
2.
When using Time-of-Day (TOD), maximum external frequency is 6MHz.
MHz
Clock Pulse Width
3,
4
3.
The high or low pulse width must be no smaller than 6.25ns or the chip will not function.
4. Parameters listed are guaranteed by design.
t
PW
6.25
ns
56F827
XTAL
EXTAL
External
Clock
V
DDA
/2
External
Clock
V
IH
V
IL
Note: The midpoint is V
IL
+ (V
IH
– V
IL
)/2.
90%
50%
10%
90%
50%
10%
t
PW
t
PW
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